{"id":259269,"date":"2023-06-19T09:00:00","date_gmt":"2023-06-19T07:00:00","guid":{"rendered":"https:\/\/sherpas.com\/blog\/?p=259269"},"modified":"2025-01-08T20:56:58","modified_gmt":"2025-01-08T19:56:58","slug":"homothetie","status":"publish","type":"post","link":"https:\/\/sherpas.com\/blog\/homothetie\/","title":{"rendered":"G\u00e9om\u00e9trie : tout sur l\u2019homoth\u00e9tie\u00a0\ud83d\udcd0\u00a0"},"content":{"rendered":"\n<p>Lorsque tu r\u00e9alises une figure g\u00e9om\u00e9trique, il peut arriver que tu doives changer les dimensions en l\u2019agrandissant ou en la r\u00e9tr\u00e9cissant pour plus de lisibilit\u00e9. Dans ce cas, il est essentiel de garder les m\u00eames <strong>proportions<\/strong> ! C\u2019est l\u00e0 que notre amie<strong> l\u2019homoth\u00e9tie<\/strong> rentre en jeu !&nbsp;<\/p>\n\n\n\n<p>Aujourd\u2019hui, on te parle de cette <strong>transformation g\u00e9om\u00e9trique<\/strong> essentielle utilis\u00e9e dans de nombreux domaines ! \ud83d\ude80<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"quest-ce-que-lhomothetie\"><strong>Qu\u2019est-ce que l\u2019homoth\u00e9tie ?<\/strong> \ud83e\udd14<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"definition\"><strong>D\u00e9finition&nbsp;<\/strong><\/h3>\n\n\n\n<p>L&rsquo;homoth\u00e9tie est une<strong> transformation g\u00e9om\u00e9trique<\/strong> qui consiste \u00e0<strong> agrandir <\/strong>ou \u00e0<strong> r\u00e9duire<\/strong> une figure en conservant ses proportions. Elle est souvent utilis\u00e9e en math\u00e9matiques et en g\u00e9om\u00e9trie pour repr\u00e9senter des objets de mani\u00e8re similaire, mais de tailles diff\u00e9rentes !&nbsp;<\/p>\n\n\n\n<p>L&rsquo;homoth\u00e9tie pr\u00e9serve certaines propri\u00e9t\u00e9s g\u00e9om\u00e9triques, telles que les angles. Elle est surtout utilis\u00e9e dans de nombreux domaines, tels que l&rsquo;art, l&rsquo;architecture, la cartographie ou le graphisme \ud83d\ude0d\u202f!&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"le-centre-dhomothetie\"><strong>Le centre d&rsquo;homoth\u00e9tie<\/strong> \ud83c\udfaf<\/h2>\n\n\n\n<p>Le<strong> centre d\u2019homoth\u00e9tie (O) <\/strong>est le point autour duquel une figure g\u00e9om\u00e9trique subit une homoth\u00e9tie ! Il reste fixe et ne change pas de position apr\u00e8s la transformation !&nbsp;<\/p>\n\n\n\n<p>\ud83d\udccc Pour le trouver, il te suffit de :&nbsp;<\/p>\n\n\n\n<p>\ud83d\udc49 Tracer une droite qui passe par les sommets A et A\u2019,<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img decoding=\"async\" src=\"https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-1.png\" alt=\"homoth\u00e9tie\" class=\"wp-image-259488\" style=\"width:368px;height:256px\" width=\"368\" height=\"256\" srcset=\"https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-1.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=512 512w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-1.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=300 300w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-1.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=180 180w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-1.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=391 391w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-1.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=288 288w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-1.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=265 265w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-1.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=60 60w\" sizes=\"(max-width: 368px) 100vw, 368px\" \/><\/figure>\n<\/div>\n\n\n<p>\ud83d\udc49 Tracer une droite qui passe par les sommets B et B&rsquo;.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img decoding=\"async\" src=\"https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-2.png\" alt=\"homoth\u00e9tie\" class=\"wp-image-259489\" style=\"width:374px;height:294px\" width=\"374\" height=\"294\" srcset=\"https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-2.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=512 512w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-2.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=300 300w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-2.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=159 159w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-2.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=346 346w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-2.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=288 288w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-2.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=473 473w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-2.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=265 265w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-2.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=60 60w\" sizes=\"(max-width: 374px) 100vw, 374px\" \/><\/figure>\n<\/div>\n\n\n<p>Eh voil\u00e0, le centre d&rsquo;homoth\u00e9tie est<strong> le point d&rsquo;intersection<\/strong> des deux droites trac\u00e9es pr\u00e9c\u00e9demment (O) \ud83d\udc47 <\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img decoding=\"async\" src=\"https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-3-1.png\" alt=\"homoth\u00e9tie\" class=\"wp-image-259492\" style=\"width:372px;height:317px\" width=\"372\" height=\"317\" srcset=\"https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-3-1.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=512 512w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-3-1.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=300 300w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-3-1.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=147 147w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-3-1.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=320 320w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-3-1.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=288 288w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-3-1.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=437 437w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-3-1.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=265 265w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-3-1.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=60 60w\" sizes=\"(max-width: 372px) 100vw, 372px\" \/><\/figure>\n<\/div>\n\n<section class=\"push \">\n        <div >\n            \n                                                <div class=\"push__container  qcd\" data-target=\"_self\" data-qcd=\"aHR0cHM6Ly9zaGVycGFzLmNvbS9mdW5uZWwtc3R1ZGVudC1xdWFsaWZpY2F0aW9u\" 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                      <p class=\"push__teachers-school\">ENS Paris-Saclay<\/p>                                                     <div class=\"push__teachers-note\">\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                            <\/div>\n                                                 <p class=\"push__teachers-price\">24\u20ac\/h<\/p>                     <\/div>\n                <\/div>\n                                            <div class=\"swiper-slide\">\n                    <div class=\"push__teachers-card\">\n                        <div\n                            class=\"push__teachers-profil\"\n                            \n                            style=\"background-image: url(https:\/\/sherpas.com\/content\/uploads\/2022\/01\/Antoine2x.png);\"\n                        >\n                    <\/div>\n                         <p class=\"push__teachers-name\">Antoine<\/p>                          <p class=\"push__teachers-school\">Sciences Po Paris<\/p>                                                     <div class=\"push__teachers-note\">\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                            <\/div>\n                                                 <p class=\"push__teachers-price\">18\u20ac\/h\/h<\/p>                     <\/div>\n                <\/div>\n                                            <div class=\"swiper-slide\">\n                    <div class=\"push__teachers-card\">\n                        <div\n                            class=\"push__teachers-profil\"\n                            \n                            style=\"background-image: url(https:\/\/sherpas.com\/content\/uploads\/2022\/01\/Margot2x.png);\"\n                        >\n                    <\/div>\n                         <p class=\"push__teachers-name\">Margot<\/p>                          <p class=\"push__teachers-school\">Arts et M\u00e9tiers ParisTech<\/p>                                                     <div class=\"push__teachers-note\">\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                            <\/div>\n                                                 <p class=\"push__teachers-price\">22\u20ac\/h\/h<\/p>                     <\/div>\n                <\/div>\n                                            <div class=\"swiper-slide\">\n                    <div class=\"push__teachers-card\">\n                        <div\n                            class=\"push__teachers-profil\"\n                            \n                            style=\"background-image: url(https:\/\/sherpas.com\/content\/uploads\/2022\/01\/Cle\u0301mence2x.png);\"\n                        >\n                    <\/div>\n                         <p class=\"push__teachers-name\">Cl\u00e9mence<\/p>                          <p class=\"push__teachers-school\">HEC Paris<\/p>                                                     <div class=\"push__teachers-note\">\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                            <\/div>\n                                                 <p class=\"push__teachers-price\">21\u20ac\/h\/h<\/p>                     <\/div>\n                <\/div>\n                                            <div class=\"swiper-slide\">\n                    <div class=\"push__teachers-card\">\n                        <div\n                            class=\"push__teachers-profil\"\n                            \n                            style=\"background-image: url(https:\/\/sherpas.com\/content\/uploads\/2022\/01\/Martin2x.jpg);\"\n                        >\n                    <\/div>\n                         <p class=\"push__teachers-name\">Martin<\/p>                          <p class=\"push__teachers-school\">HEC Paris<\/p>                                                     <div class=\"push__teachers-note\">\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                            <\/div>\n                                                 <p class=\"push__teachers-price\">23\u20ac\/h<\/p>                     <\/div>\n                <\/div>\n                                            <div class=\"swiper-slide\">\n                    <div class=\"push__teachers-card\">\n                        <div\n                            class=\"push__teachers-profil\"\n                            \n                            style=\"background-image: url(https:\/\/sherpas.com\/content\/uploads\/2022\/01\/Nicolas2x.png);\"\n                        >\n                    <\/div>\n                         <p class=\"push__teachers-name\">Nicolas<\/p>                          <p class=\"push__teachers-school\">CentraleSup\u00e9lec<\/p>                                                     <div class=\"push__teachers-note\">\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                            <\/div>\n                                                 <p class=\"push__teachers-price\">17\u20ac\/h<\/p>                     <\/div>\n                <\/div>\n                                            <div class=\"swiper-slide\">\n                    <div class=\"push__teachers-card\">\n                        <div\n                            class=\"push__teachers-profil\"\n                            \n                            style=\"background-image: url(https:\/\/sherpas.com\/content\/uploads\/2022\/01\/Jade2x.jpg);\"\n                        >\n                    <\/div>\n                         <p class=\"push__teachers-name\">Jade<\/p>                          <p class=\"push__teachers-school\">Sciences Po Paris<\/p>                                                     <div class=\"push__teachers-note\">\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                            <\/div>\n                                                 <p class=\"push__teachers-price\">21\u20ac\/h<\/p>                     <\/div>\n                <\/div>\n                                            <div class=\"swiper-slide\">\n                    <div class=\"push__teachers-card\">\n                        <div\n                            class=\"push__teachers-profil\"\n                            \n                            style=\"background-image: url(https:\/\/sherpas.com\/content\/uploads\/2022\/01\/Noemie2x.jpg);\"\n                        >\n                    <\/div>\n                         <p class=\"push__teachers-name\">No\u00e9mie<\/p>                          <p class=\"push__teachers-school\">M2 en droit \u00e0 Assas<\/p>                                                     <div class=\"push__teachers-note\">\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                          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             <div class=\"push__title\"><p>Ton premier cours particulier est offert ! <span role=\"img\" aria-label=\"\ud83c\udf81\">\ud83c\udf81<\/span><!-- notionvc: 91b6b7d7-50f2-46f4-ae1f-ecbabe834aad --><\/p>\n<\/div>\n                                                                                        <div class=\"push__text\"><p>Nos profs sont pass\u00e9s par les meilleures \u00e9coles et universit\u00e9s.<!-- notionvc: 21bb66b6-b36d-4ce8-8950-173722d75a1e --><\/p>\n<p>&nbsp;<\/p>\n<\/div>\n                                                        <div class=\"push__promo-button   \">\n                                                                                                    <div\n                                        class=\"btn btn-primary\"\n                                        style=\"color: #ffffff; border-color: ; background-color: \"\n\n                                    >\n                                        J&rsquo;EN PROFITE MAINTENANT !\n                                    <\/div>\n                                                            <\/div>\n                                                    <\/div>\n                                    <\/div>\n                                    <\/div>\n    <\/section>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"rapport-dhomothetie\"><strong>Rapport d&rsquo;homoth\u00e9tie<\/strong> \ud83e\uddd0<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"explication\"><strong>Explication&nbsp;<\/strong><\/h3>\n\n\n\n<p>\ud83d\udccc Le rapport d\u2019homoth\u00e9tie est le rapport de proportionnalit\u00e9 entre deux figures apr\u00e8s une homoth\u00e9tie !&nbsp;<\/p>\n\n\n\n<p>\ud83d\udccc Par exemple, si un rapport d\u2019homoth\u00e9tie est \u00e9gal \u00e0 2, cela signifie que la figure est <strong>deux fois plus grande <\/strong>que la premi\u00e8re. A contrario, s&rsquo;il est \u00e9gal \u00e0 0,5, la figure est <strong>deux fois plus petite<\/strong> \ud83d\ude09.&nbsp;<\/p>\n\n\n\n<p>\ud83d\udccc Il est not\u00e9 par la variable <strong>k<\/strong> et peut aussi \u00eatre appel\u00e9 <strong>rapport de similitude<\/strong> !&nbsp;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"influence-de-sa-valeur\"><strong>Influence de sa valeur&nbsp;<\/strong><\/h3>\n\n\n\n<p>Le rapport d\u2019homoth\u00e9tie influence la taille de la figure, mais pas seulement ! Il influence aussi<strong> son sens <\/strong>dans certains cas. \ud83d\udc47<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"influence-de-sa-valeur-sur-la-taille\"><strong>Influence de sa valeur sur la taille&nbsp;<\/strong><\/h4>\n\n\n\n<p>\ud83d\udc49 Lorsque k &gt; 1, \u00e7a signifie que la figure aura des dimensions plus grandes que l&rsquo;originelle. Par exemple, si k = 2, la figure sera deux fois plus grande que l\u2019originelle.&nbsp;<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img decoding=\"async\" src=\"https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-4.png\" alt=\"homoth\u00e9tie\" class=\"wp-image-259493\" style=\"width:349px;height:411px\" width=\"349\" height=\"411\" srcset=\"https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-4.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=435 435w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-4.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=255 255w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-4.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=106 106w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-4.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=231 231w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-4.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=288 288w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-4.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=315 315w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-4.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=265 265w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-4.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=51 51w\" sizes=\"(max-width: 349px) 100vw, 349px\" \/><\/figure>\n<\/div>\n\n\n<p>\ud83d\udc49 Lorsque 0 &lt; k &lt; 1, \u00e7a signifie que la figure aura des dimensions plus petites que l\u2019originelle.&nbsp;<\/p>\n\n\n\n<p>Par exemple, si k = 0,5, la figure sera deux fois plus petite que l\u2019originelle.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img decoding=\"async\" src=\"https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-5.png\" alt=\"homoth\u00e9tie\" class=\"wp-image-259494\" style=\"width:318px;height:345px\" width=\"318\" height=\"345\" srcset=\"https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-5.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=472 472w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-5.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=277 277w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-5.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=115 115w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-5.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=251 251w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-5.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=288 288w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-5.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=342 342w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-5.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=265 265w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-5.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=55 55w\" sizes=\"(max-width: 318px) 100vw, 318px\" \/><\/figure>\n<\/div>\n\n\n<p>\ud83d\udc49 Lorsque k = 1, \u00e7a signifie que la figure aura exactement les m\u00eames proportions que l\u2019originelle.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"influence-de-sa-valeur-sur-le-sens\"><strong>Influence de sa valeur sur le sens&nbsp;<\/strong><\/h4>\n\n\n\n<p>Le sens de la figure va uniquement changer lorsque k &lt; 0. Dans ce cas, le centre d\u2019homoth\u00e9tie O devient comme un axe de sym\u00e9trie, et la figure change de sens comme si elle \u00e9tait face \u00e0 un miroir !&nbsp;<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img decoding=\"async\" src=\"https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-6-1.png\" alt=\"homoth\u00e9tie\" class=\"wp-image-259496\" style=\"width:335px;height:344px\" width=\"335\" height=\"344\" srcset=\"https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-6-1.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=499 499w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-6-1.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=292 292w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-6-1.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=122 122w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-6-1.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=265 265w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-6-1.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=288 288w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-6-1.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=362 362w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-6-1.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=58 58w\" sizes=\"(max-width: 335px) 100vw, 335px\" \/><\/figure>\n<\/div>\n\n\n<p>k = -1<\/p>\n\n\n<section class=\"read-also\">\n    <p class=\"read-also__title\">\u00c0 lire aussi<\/p>\n            <div class=\"read-also__list\">\n            <p>D\u00e9couvre avec nous un des solides phares de la g\u00e9om\u00e9trie :<a href=\"https:\/\/sherpas.com\/blog\/tetraedre-geometrie\/\"> le t\u00e9tra\u00e8dre<\/a> ! \ud83d\udd3a<\/p>\n\n        <\/div>\n    <\/section>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"calculer-le-rapport-dhomothetie\"><strong>Calculer le rapport d\u2019homoth\u00e9tie&nbsp;<\/strong><\/h3>\n\n\n\n<p>Pour calculer le rapport d\u2019homoth\u00e9tie ou rapport de proportionnalit\u00e9 entre les deux figures, il suffit d\u2019utiliser la formule suivante \ud83d\udc47&nbsp;<\/p>\n\n\n\n<p>k = Distance entre le centre d\u2019homoth\u00e9tie et le sommet de l\u2019image \/ Distance entre le centre d\u2019homoth\u00e9tie et le sommet initial<\/p>\n\n\n<p><img decoding=\"async\" src=\"https:\/\/sherpas.com\/content\/ql-cache\/quicklatex.com-0c26afa544a813bf8af2769314d2cd76_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#107;&#61;&#123;&#92;&#102;&#114;&#97;&#99;&#123;&#79;&#65;&#39;&#125;&#123;&#79;&#65;&#125;&#125;&#61;&#123;&#92;&#102;&#114;&#97;&#99;&#123;&#79;&#66;&#39;&#125;&#123;&#79;&#66;&#125;&#125;&#61;&#123;&#92;&#102;&#114;&#97;&#99;&#123;&#79;&#67;&#39;&#125;&#123;&#79;&#67;&#125;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"24\" width=\"168\" style=\"vertical-align: -6px;\"\/><\/p>\n\n\n<section class=\"relance\">\n        <div >\n                            <a target=\"_blank\" href=\"https:\/\/sherpas.com\/cours\/maths\">\n                    <div class=\"relance__container\"\n                        >\n                        \n                                                        <picture>\n                            <source srcset=\"https:\/\/sherpas.com\/content\/uploads\/2023\/03\/grand-oral-maths.jpg\" media=\"(min-width: 999px)\">\n                            <source srcset=\"https:\/\/sherpas.com\/content\/uploads\/2023\/03\/grand-oral-maths.jpg\" media=\"(max-width: 999px)\">\n                                <img decoding=\"async\"\n                                    src=\"https:\/\/sherpas.com\/content\/uploads\/2023\/03\/grand-oral-maths.jpg\"\n                                    alt=\"Grand oral Maths\"\n                                >\n                            <\/picture>\n                                                <div class=\"relance__content\">\n                            \n                                <div class=\"relance__title\"> <p>Besoin d&rsquo;aide pour tes cours de maths ? Pas de soucis, prends des cours particuliers avec un de nos Sherpas ! \ud83d\ude09<\/p>\n<\/div>\n                                                        <button type=\"button\"\n                                    class=\"relance__button btn btn-white\">\n                                Trouve ton prof !\n                            <\/button>\n                        <\/div>\n                    <\/div>\n                <\/a>\n                    <\/div>\n    <\/section>\n\n    \n\n\n<h2 class=\"wp-block-heading\" id=\"la-construction-dune-figure-par-homothetie\"><strong>La construction d&rsquo;une figure par homoth\u00e9tie<\/strong> \ud83d\udcd0<\/h2>\n\n\n\n<p>On arrive sur la partie un peu plus d\u00e9licate de cette notion : la construction de l\u2019image \ud83d\ude2c. Pas de panique, on t\u2019explique \u00e7a \u00e9tape par \u00e9tape&nbsp; ! \ud83d\udc47 !<\/p>\n\n\n\n<p>\ud83d\udc49 Prenons par exemple cette figure avec un rapport d\u2019homoth\u00e9tie not\u00e9 k=2<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img decoding=\"async\" src=\"https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-7.png\" alt=\"homoth\u00e9tie\" class=\"wp-image-259497\" style=\"width:358px;height:315px\" width=\"358\" height=\"315\" srcset=\"https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-7.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=512 512w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-7.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=300 300w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-7.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=142 142w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-7.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=309 309w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-7.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=288 288w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-7.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=421 421w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-7.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=265 265w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-7.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=60 60w\" sizes=\"(max-width: 358px) 100vw, 358px\" \/><\/figure>\n<\/div>\n\n\n<ol class=\"wp-block-list\">\n<li>Trace une droite reliant chaque sommet au centre d\u2019homoth\u00e9tie<\/li>\n<\/ol>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img decoding=\"async\" src=\"https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-8.png\" alt=\"homoth\u00e9tie\" class=\"wp-image-259499\" style=\"width:362px;height:301px\" width=\"362\" height=\"301\" srcset=\"https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-8.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=512 512w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-8.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=300 300w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-8.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=150 150w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-8.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=327 327w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-8.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=288 288w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-8.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=446 446w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-8.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=265 265w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-8.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=60 60w\" sizes=\"(max-width: 362px) 100vw, 362px\" \/><\/figure>\n<\/div>\n\n\n<ol class=\"wp-block-list\" start=\"2\">\n<li>Tu vas ensuite mesurer chaque distance entre les sommets et le centre d\u2019homoth\u00e9tie, puis multiplier ces distances par le rapport d\u2019homoth\u00e9tie. Ces calculs vont te permettre de trouver la distance s\u00e9parant les sommets de l\u2019image avec le centre d\u2019homoth\u00e9tie !<\/li>\n<\/ol>\n\n\n<p><img decoding=\"async\" src=\"https:\/\/sherpas.com\/content\/ql-cache\/quicklatex.com-e499cae84c7965c785d31240dd5ddf15_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#79;&#66;&#32;&#61;&#32;&#51;&#32;&#99;&#109;\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"84\" style=\"vertical-align: 0px;\"\/> <\/p>\n<p><img decoding=\"async\" src=\"https:\/\/sherpas.com\/content\/ql-cache\/quicklatex.com-3233544f2edf47901146fdd6130536b1_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#79;&#66;&#39;&#32;&#61;&#32;&#51;&#92;&#116;&#105;&#109;&#101;&#115;&#32;&#107;&#61;&#32;&#51;&#92;&#116;&#105;&#109;&#101;&#115;&#32;&#50;&#32;&#61;&#32;&#54;&#32;&#99;&#109;\" title=\"Rendered by QuickLaTeX.com\" height=\"14\" width=\"216\" style=\"vertical-align: 0px;\"\/><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/sherpas.com\/content\/ql-cache\/quicklatex.com-705d498c5eea5cb6661583c3713966ea_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#79;&#67;&#32;&#61;&#32;&#51;&#32;&#99;&#109;\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"84\" style=\"vertical-align: 0px;\"\/><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/sherpas.com\/content\/ql-cache\/quicklatex.com-932ba183c48298c65cba22c15c0c0743_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#79;&#67;&#39;&#32;&#61;&#32;&#51;&#92;&#116;&#105;&#109;&#101;&#115;&#32;&#107;&#61;&#32;&#51;&#92;&#116;&#105;&#109;&#101;&#115;&#32;&#50;&#32;&#61;&#32;&#54;&#32;&#99;&#109;\" title=\"Rendered by QuickLaTeX.com\" height=\"14\" width=\"215\" style=\"vertical-align: 0px;\"\/><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/sherpas.com\/content\/ql-cache\/quicklatex.com-8f48e96150fa9372dad2761ddb168621_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#79;&#65;&#32;&#61;&#32;&#53;&#32;&#99;&#109;\" title=\"Rendered by QuickLaTeX.com\" height=\"13\" width=\"83\" style=\"vertical-align: 0px;\"\/> <\/p>\n<p><img decoding=\"async\" src=\"https:\/\/sherpas.com\/content\/ql-cache\/quicklatex.com-09c18a84f46310aa8f2bfb1f41a72346_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#79;&#65;&#39;&#32;&#61;&#32;&#53;&#92;&#116;&#105;&#109;&#101;&#115;&#32;&#107;&#61;&#32;&#53;&#92;&#116;&#105;&#109;&#101;&#115;&#32;&#50;&#32;&#61;&#32;&#49;&#48;&#32;&#99;&#109;\" title=\"Rendered by QuickLaTeX.com\" height=\"14\" width=\"223\" style=\"vertical-align: 0px;\"\/><\/p>\n\n\n\n<ol class=\"wp-block-list\" start=\"3\">\n<li>Tu reportes ensuite ces mesures sur les droites que tu as pr\u00e9c\u00e9demment trac\u00e9es ! Par exemple, pour reporter A\u2019, tu mesures 10 cm sur ta droite passant par A, en partant de O\u202f!&nbsp;<\/li>\n<\/ol>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img decoding=\"async\" src=\"https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-9.png\" alt=\"homoth\u00e9tie\" class=\"wp-image-259500\" style=\"width:344px;height:289px\" width=\"344\" height=\"289\" srcset=\"https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-9.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=512 512w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-9.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=300 300w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-9.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=149 149w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-9.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=324 324w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-9.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=288 288w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-9.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=442 442w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-9.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=265 265w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-9.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=60 60w\" sizes=\"(max-width: 344px) 100vw, 344px\" \/><\/figure>\n<\/div>\n\n\n<ol class=\"wp-block-list\" start=\"4\">\n<li>Pour finir, il te suffit de relier les points, pour tracer ta figure \ud83e\udd73<\/li>\n<\/ol>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img decoding=\"async\" src=\"https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-10.png\" alt=\"homoth\u00e9tie\" class=\"wp-image-259501\" style=\"width:346px;height:335px\" width=\"346\" height=\"335\" srcset=\"https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-10.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=512 512w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-10.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=300 300w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-10.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=129 129w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-10.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=281 281w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-10.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=288 288w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-10.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=384 384w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-10.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=265 265w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-10.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=60 60w\" sizes=\"(max-width: 346px) 100vw, 346px\" \/><\/figure>\n<\/div>\n\n<section class=\"push \">\n        <div >\n            \n                                                <div class=\"push__container  qcd\" data-target=\"_self\" data-qcd=\"aHR0cHM6Ly9zaGVycGFzLmNvbS9mdW5uZWwtc3R1ZGVudC1xdWFsaWZpY2F0aW9u\" data-banner=\"2\" data-name=\"CPM1 Maths\" style=\"background-color: #F3FBF7\" >\n                                                                        <div class=\"push__teachers\">\n    <div class=\"d-flex justify-content-center d-md-none\">\n        <img decoding=\"async\" class=\"push__logo\" src=\"\/content\/themes\/sherpas-theme\/dist\/images\/logo.svg\" alt=\"Logo Sherpas\">\n    <\/div>\n    <div class=\"swiper\">\n        <div class=\"swiper-wrapper\">\n                                            <div class=\"swiper-slide\">\n                    <div class=\"push__teachers-card\">\n                        <div\n                            class=\"push__teachers-profil\"\n                            \n                            style=\"background-image: url(https:\/\/sherpas.com\/content\/uploads\/2022\/01\/Louise2x.png);\"\n                        >\n                    <\/div>\n                         <p class=\"push__teachers-name\">Louise<\/p>                          <p class=\"push__teachers-school\">Mines ParisTech<\/p>                                                     <div class=\"push__teachers-note\">\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                            <\/div>\n                                                 <p class=\"push__teachers-price\">24\u20ac\/h<\/p>                     <\/div>\n                <\/div>\n                                            <div class=\"swiper-slide\">\n                    <div class=\"push__teachers-card\">\n                        <div\n                            class=\"push__teachers-profil\"\n                            \n                            style=\"background-image: url(https:\/\/sherpas.com\/content\/uploads\/2022\/01\/Nicolas2x.png);\"\n                        >\n                    <\/div>\n                         <p class=\"push__teachers-name\">Nicolas<\/p>                          <p class=\"push__teachers-school\">CentraleSup\u00e9lec<\/p>                                                     <div class=\"push__teachers-note\">\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                            <\/div>\n                                                 <p class=\"push__teachers-price\">17\u20ac\/h<\/p>                     <\/div>\n                <\/div>\n                                            <div class=\"swiper-slide\">\n                    <div class=\"push__teachers-card\">\n                        <div\n                            class=\"push__teachers-profil\"\n                            \n                            style=\"background-image: url(https:\/\/sherpas.com\/content\/uploads\/2022\/01\/Fabien2x.png);\"\n                        >\n                    <\/div>\n                         <p class=\"push__teachers-name\">Fabien<\/p>                          <p class=\"push__teachers-school\">T\u00e9l\u00e9com Paris<\/p>                                                     <div class=\"push__teachers-note\">\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                            <\/div>\n                                                 <p class=\"push__teachers-price\">20\u20ac\/h<\/p>                     <\/div>\n                <\/div>\n                                            <div class=\"swiper-slide\">\n                    <div class=\"push__teachers-card\">\n                        <div\n                            class=\"push__teachers-profil\"\n                            \n                            style=\"background-image: url(https:\/\/sherpas.com\/content\/uploads\/2022\/01\/Cle\u0301mence2x.png);\"\n                        >\n                    <\/div>\n                         <p class=\"push__teachers-name\">Cl\u00e9mence<\/p>                          <p class=\"push__teachers-school\">HEC Paris<\/p>                                                     <div class=\"push__teachers-note\">\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                            <\/div>\n                                                 <p class=\"push__teachers-price\">21\u20ac\/h\/h<\/p>                     <\/div>\n                <\/div>\n                                            <div class=\"swiper-slide\">\n                    <div class=\"push__teachers-card\">\n                        <div\n                            class=\"push__teachers-profil\"\n                            \n                            style=\"background-image: url(https:\/\/sherpas.com\/content\/uploads\/2022\/01\/Bastien2x.jpg);\"\n                        >\n                    <\/div>\n                         <p class=\"push__teachers-name\">Bastien<\/p>                          <p class=\"push__teachers-school\">Polytechnique<\/p>                                                     <div class=\"push__teachers-note\">\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                            <\/div>\n                                                 <p class=\"push__teachers-price\">26\u20ac\/h<\/p>                     <\/div>\n                <\/div>\n                                            <div class=\"swiper-slide\">\n                    <div class=\"push__teachers-card\">\n                        <div\n                            class=\"push__teachers-profil\"\n                            \n                            style=\"background-image: url(https:\/\/sherpas.com\/content\/uploads\/2022\/01\/Pierre2x.png);\"\n                        >\n                    <\/div>\n                         <p class=\"push__teachers-name\">Pierre<\/p>                          <p class=\"push__teachers-school\">ESSEC<\/p>                                                     <div class=\"push__teachers-note\">\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                            <\/div>\n                                                 <p class=\"push__teachers-price\">16\u20ac\/h<\/p>                     <\/div>\n                <\/div>\n                                            <div class=\"swiper-slide\">\n                    <div class=\"push__teachers-card\">\n                        <div\n                            class=\"push__teachers-profil\"\n                            \n                            style=\"background-image: url(https:\/\/sherpas.com\/content\/uploads\/2022\/01\/Simon2x.jpg);\"\n                        >\n                    <\/div>\n                         <p class=\"push__teachers-name\">Simon<\/p>                          <p class=\"push__teachers-school\">4e ann\u00e9e de m\u00e9decine<\/p>                                                     <div class=\"push__teachers-note\">\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                            <\/div>\n                                                 <p class=\"push__teachers-price\">26\u20ac\/h<\/p>                     <\/div>\n                <\/div>\n                                            <div class=\"swiper-slide\">\n                    <div class=\"push__teachers-card\">\n                        <div\n                            class=\"push__teachers-profil\"\n                            \n                            style=\"background-image: url(https:\/\/sherpas.com\/content\/uploads\/2022\/01\/Jade2x.jpg);\"\n                        >\n                    <\/div>\n                         <p class=\"push__teachers-name\">Jade<\/p>                          <p class=\"push__teachers-school\">Sciences Po Paris<\/p>                                                     <div class=\"push__teachers-note\">\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                                    <svg  class=\"active\" >\n                                        <use\n                                            xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#star\"\/>\n                                    <\/svg>\n                                                            <\/div>\n                                                 <p class=\"push__teachers-price\">21\u20ac\/h<\/p>                     <\/div>\n                <\/div>\n                    <\/div>\n    <\/div>\n<\/div>\n                                                    <div class=\"push__content\">\n                                                            <div  class=\"d-none d-md-block\" >\n                                    <img decoding=\"async\" class=\"push__logo\" src=\"\/content\/themes\/sherpas-theme\/dist\/images\/logo.svg\"\n                                        alt=\"Logo Sherpas\">\n                                <\/div>\n                                                                                        <div class=\"push__title\"><p>Besoin d&rsquo;un <span style=\"color: #4cc583;\">prof particulier<\/span> de maths ? <span role=\"image\" aria-label=\"\u2728\">\u2728<\/span><\/p>\n<\/div>\n                                                                                        <div class=\"push__text\"><p>Nos Sherpas sont l\u00e0 pour t&rsquo;aider \u00e0 progresser et prendre confiance en toi !<\/p>\n<\/div>\n                                                        <div class=\"push__promo-button   \">\n                                                                                                    <div\n                                        class=\"btn btn-primary\"\n                                        style=\"color: ; border-color: ; background-color: \"\n\n                                    >\n                                        JE PRENDS UN COURS OFFERT !\n                                    <\/div>\n                                                            <\/div>\n                                                    <\/div>\n                                    <\/div>\n                                    <\/div>\n    <\/section>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"exercices\"><strong>Exercices<\/strong> \u270d\ufe0f<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"trouve-le-centre-dhomothetie-de-cette-figure\"><strong>Trouve le centre d\u2019homoth\u00e9tie de cette figure&nbsp;<\/strong><\/h3>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img decoding=\"async\" src=\"https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-11.png\" alt=\"homoth\u00e9tie\" class=\"wp-image-259502\" style=\"width:378px;height:349px\" width=\"378\" height=\"349\" srcset=\"https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-11.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=512 512w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-11.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=300 300w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-11.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=135 135w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-11.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=294 294w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-11.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=288 288w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-11.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=402 402w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-11.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=265 265w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-11.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=60 60w\" sizes=\"(max-width: 378px) 100vw, 378px\" \/><\/figure>\n<\/div>\n\n\n<p><strong>Correction :&nbsp;<\/strong><\/p>\n\n\n\n<p>\ud83d\udc49 Trace une droite reliant B et B\u2019<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img decoding=\"async\" src=\"https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-12-1.png\" alt=\"homoth\u00e9tie\" class=\"wp-image-259504\" style=\"width:368px;height:312px\" width=\"368\" height=\"312\" srcset=\"https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-12-1.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=512 512w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-12-1.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=300 300w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-12-1.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=147 147w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-12-1.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=321 321w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-12-1.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=288 288w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-12-1.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=438 438w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-12-1.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=265 265w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-12-1.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=60 60w\" sizes=\"(max-width: 368px) 100vw, 368px\" \/><\/figure>\n<\/div>\n\n\n<p class=\"has-text-align-left\">\ud83d\udc49 Trace une droite reliant C et C&rsquo;<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img decoding=\"async\" src=\"https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-13.png\" alt=\"homoth\u00e9tie\" class=\"wp-image-259505\" style=\"width:402px;height:312px\" width=\"402\" height=\"312\" srcset=\"https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-13.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=512 512w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-13.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=300 300w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-13.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=161 161w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-13.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=351 351w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-13.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=288 288w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-13.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=478 478w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-13.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=265 265w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-13.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=60 60w\" sizes=\"(max-width: 402px) 100vw, 402px\" \/><\/figure>\n<\/div>\n\n\n<p>\ud83d\udc49 Le centre d&rsquo;homoth\u00e9tie est le point d&rsquo;intersection des deux droites trac\u00e9es pr\u00e9alablement (O) !&nbsp;<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img decoding=\"async\" src=\"https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-14.png\" alt=\"homoth\u00e9tie\" class=\"wp-image-259506\" style=\"width:378px;height:304px\" width=\"378\" height=\"304\" srcset=\"https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-14.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=512 512w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-14.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=300 300w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-14.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=155 155w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-14.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=338 338w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-14.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=288 288w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-14.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=461 461w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-14.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=265 265w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-14.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=60 60w\" sizes=\"(max-width: 378px) 100vw, 378px\" \/><\/figure>\n<\/div>\n\n\n<h3 class=\"wp-block-heading\" id=\"calcule-le-rapport-dhomothetie-de-cette-figure\"><strong>Calcule le rapport d\u2019homoth\u00e9tie de cette figure&nbsp;<\/strong><\/h3>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img decoding=\"async\" src=\"https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-16.png\" alt=\"homoth\u00e9tie\" class=\"wp-image-259507\" style=\"width:408px;height:248px\" width=\"408\" height=\"248\" srcset=\"https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-16.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=512 512w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-16.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=300 300w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-16.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=200 200w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-16.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=396 396w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-16.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=288 288w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-16.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=265 265w, https:\/\/xapbm7c37i.cloudimg.io\/https:\/\/sherpas.com\/blog\/content\/uploads\/2023\/06\/homothetie-16.png?q=85&amp;force_format=webp&amp;org_if_sml=1&amp;w=60 60w\" sizes=\"(max-width: 408px) 100vw, 408px\" \/><\/figure>\n<\/div>\n\n\n<p><strong>Correction :&nbsp;<\/strong><\/p>\n\n\n\n<p>Pour calculer le rapport d\u2019homoth\u00e9tie, il nous faut calculer les distances OA et OA\u2019<\/p>\n\n\n<p><img decoding=\"async\" src=\"https:\/\/sherpas.com\/content\/ql-cache\/quicklatex.com-090b0cb8cc0aa4b3b66724c99ce4f6ae_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#79;&#65;&#32;&#61;&#32;&#51;&#32;&#99;&#109;\" title=\"Rendered by QuickLaTeX.com\" height=\"13\" width=\"83\" style=\"vertical-align: 0px;\"\/><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/sherpas.com\/content\/ql-cache\/quicklatex.com-26996e9b9d017fc9b69cfc07edaec8aa_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#79;&#65;&#39;&#32;&#61;&#32;&#57;&#32;&#99;&#109;\" title=\"Rendered by QuickLaTeX.com\" height=\"14\" width=\"87\" style=\"vertical-align: 0px;\"\/><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/sherpas.com\/content\/ql-cache\/quicklatex.com-34fa68f39495027332cd35af0365f238_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#107;&#61;&#123;&#92;&#102;&#114;&#97;&#99;&#123;&#79;&#65;&#39;&#125;&#123;&#79;&#65;&#125;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"24\" width=\"61\" style=\"vertical-align: -6px;\"\/><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/sherpas.com\/content\/ql-cache\/quicklatex.com-0a1b227b73924e0dd415187d96335abb_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#107;&#61;&#123;&#92;&#102;&#114;&#97;&#99;&#123;&#57;&#125;&#123;&#51;&#125;&#125;&#61;&#51;\" title=\"Rendered by QuickLaTeX.com\" height=\"22\" width=\"77\" style=\"vertical-align: -6px;\"\/><\/p>\n\n\n\n<p>On a donc un rapport d\u2019homoth\u00e9tie de 3, c&rsquo;est-\u00e0-dire que l\u2019image est trois fois plus grande que la figure originelle.&nbsp;<\/p>\n\n\n<section class=\"you-know\">\n                <div class=\"you-know__title\"><p>\ud83d\udca1 Pour info<\/p>\n<\/div>\n                        <div class=\"you-know__text\">\n            <p>On aurait peu utilis\u00e9 OC et OC\u2019 ainsi qu\u2019OB et OB\u2019 \ud83d\ude09<\/p>\n\n        <\/div>\n              <\/section>\n\n\n\n<p><\/p>\n\n\n\n<p>Voil\u00e0 maintenant, tu sais tout sur l\u2019homoth\u00e9tie et tu es capable de reproduire une figure avec pr\u00e9cision peu importe sa taille ! Si tu as besoin de plus d\u2019aide en maths, n\u2019h\u00e9site pas \u00e0 contacter l\u2019un de nos Sherpas pour <a href=\"https:\/\/sherpas.com\/cours\/maths\/online\">prendre des cours particuliers de maths en ligne<\/a> !<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img decoding=\"async\" src=\"https:\/\/media4.giphy.com\/media\/UrcXN0zTfzTPi\/giphy.gif?cid=ecf05e47v8z8gnafmqtau6cmnyp6ky6oq4nl39ml1wf2z6ja&amp;ep=v1_gifs_search&amp;rid=giphy.gif&amp;ct=g\" alt=\"bye bye\" style=\"width:357px;height:291px\" width=\"357\" height=\"291\" \/><\/figure>\n<\/div>\n\n<section class=\"faq\">\n    <div class=\"container\" itemscope itemtype=\"http:\/\/schema.org\/FAQPage\">\n        <div class=\"faq__title\">\n                        <h2 id=\"faq\">FAQ \u2705<\/h2>\n                    <\/div>\n         <div class=\"faq__questions\">\n                                                                             <div class=\"faq__questions--item \" itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\">\n                <div class=\"faq__questions--title  collapsed\">\n                    <p class=\"h4\" itemprop=\"name\">Comment d\u00e9finir une homoth\u00e9tie?<\/p>\n                    <svg>\n                        <use\n                        xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#chevron-right\"\/>\n                    <\/svg>\n                <\/div>\n                <div class=\"faq__questions--content\" style=\"max-height: 0px\" itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\">\n                    <div itemprop=\"text\"><p>L&rsquo;homoth\u00e9tie est une transformation g\u00e9om\u00e9trique qui agrandit ou r\u00e9duit une figure par rapport \u00e0 un point fixe, appel\u00e9 le centre d&rsquo;homoth\u00e9tie. Elle conserve les formes mais modifie les tailles.<\/p>\n<\/div>\n                <\/div>\n             <\/div>\n                                                                 <div class=\"faq__questions--item \" itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\">\n                <div class=\"faq__questions--title  collapsed\">\n                    <p class=\"h4\" itemprop=\"name\">Comment calcule-t-on une homoth\u00e9tie?<\/p>\n                    <svg>\n                        <use\n                        xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#chevron-right\"\/>\n                    <\/svg>\n                <\/div>\n                <div class=\"faq__questions--content\" style=\"max-height: 0px\" itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\">\n                    <div itemprop=\"text\"><p>Pour effectuer une homoth\u00e9tie, on multiplie la distance entre chaque point de la figure et le centre d&rsquo;homoth\u00e9tie par le rapport d&rsquo;homoth\u00e9tie. Ceci donne les nouveaux emplacements des points.<\/p>\n<\/div>\n                <\/div>\n             <\/div>\n                                                                 <div class=\"faq__questions--item \" itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\">\n                <div class=\"faq__questions--title  collapsed\">\n                    <p class=\"h4\" itemprop=\"name\">Quelles sont les propri\u00e9t\u00e9s d&rsquo;une homoth\u00e9tie?<\/p>\n                    <svg>\n                        <use\n                        xlink:href=\"\/content\/themes\/sherpas-theme\/dist\/images\/sprite.svg#chevron-right\"\/>\n                    <\/svg>\n                <\/div>\n                <div class=\"faq__questions--content\" style=\"max-height: 0px\" itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\">\n                    <div itemprop=\"text\"><p>L&rsquo;homoth\u00e9tie conserve les angles, les parall\u00e9lismes et les alignements. Toutefois, elle modifie les longueurs selon le rapport d&rsquo;homoth\u00e9tie choisi.<\/p>\n<\/div>\n                <\/div>\n             <\/div>\n                                <\/div>\n    <\/div>\n<\/section>\n\n\n<div class=\"kk-star-ratings kksr-auto kksr-align-center kksr-valign-bottom\"\n    data-payload='{&quot;align&quot;:&quot;center&quot;,&quot;id&quot;:&quot;259269&quot;,&quot;slug&quot;:&quot;default&quot;,&quot;valign&quot;:&quot;bottom&quot;,&quot;ignore&quot;:&quot;&quot;,&quot;reference&quot;:&quot;auto&quot;,&quot;class&quot;:&quot;&quot;,&quot;count&quot;:&quot;9&quot;,&quot;legendonly&quot;:&quot;&quot;,&quot;readonly&quot;:&quot;&quot;,&quot;score&quot;:&quot;4&quot;,&quot;starsonly&quot;:&quot;&quot;,&quot;best&quot;:&quot;5&quot;,&quot;gap&quot;:&quot;5&quot;,&quot;greet&quot;:&quot;Tu as aim\u00e9 cet article ?&quot;,&quot;legend&quot;:&quot;4\\\/5 - (9 votes)&quot;,&quot;size&quot;:&quot;24&quot;,&quot;title&quot;:&quot;G\u00e9om\u00e9trie : tout sur l\u2019homoth\u00e9tie\u00a0\ud83d\udcd0\u00a0&quot;,&quot;width&quot;:&quot;113.5&quot;,&quot;_legend&quot;:&quot;{score}\\\/{best} - ({count} {votes})&quot;,&quot;font_factor&quot;:&quot;1.25&quot;}'>\n            \n<div class=\"kksr-stars\">\n    \n<div class=\"kksr-stars-inactive\">\n            <div class=\"kksr-star\" data-star=\"1\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"2\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"3\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"4\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"5\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n    <\/div>\n    \n<div class=\"kksr-stars-active\" style=\"width: 113.5px;\">\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n    <\/div>\n<\/div>\n                \n\n<div class=\"kksr-legend\" style=\"font-size: 19.2px;\">\n            4\/5 - (9 votes)    <\/div>\n    <\/div>\n","protected":false},"excerpt":{"rendered":"<p>Lorsque tu r\u00e9alises une figure g\u00e9om\u00e9trique, il peut arriver que tu doives changer les dimensions en l\u2019agrandissant ou (&#8230;)<\/p>\n","protected":false},"author":326,"featured_media":259508,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"category":[803,810],"tag":[771],"class_list":["post-259269","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-apprendre-matiere","category-maths","tag-geometrie"],"acf":[],"_links":{"self":[{"href":"https:\/\/sherpas.com\/blog\/wp-json\/wp\/v2\/posts\/259269","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sherpas.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/sherpas.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/sherpas.com\/blog\/wp-json\/wp\/v2\/users\/326"}],"replies":[{"embeddable":true,"href":"https:\/\/sherpas.com\/blog\/wp-json\/wp\/v2\/comments?post=259269"}],"version-history":[{"count":0,"href":"https:\/\/sherpas.com\/blog\/wp-json\/wp\/v2\/posts\/259269\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/sherpas.com\/blog\/wp-json\/wp\/v2\/media\/259508"}],"wp:attachment":[{"href":"https:\/\/sherpas.com\/blog\/wp-json\/wp\/v2\/media?parent=259269"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sherpas.com\/blog\/wp-json\/wp\/v2\/category?post=259269"},{"taxonomy":"tag","embeddable":true,"href":"https:\/\/sherpas.com\/blog\/wp-json\/wp\/v2\/tag?post=259269"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}