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{"id":13238,"date":"2018-01-10T23:24:53","date_gmt":"2018-01-10T23:24:53","guid":{"rendered":"https:\/\/www.acasinhadamatematica.pt\/?p=13238"},"modified":"2022-01-16T23:14:47","modified_gmt":"2022-01-16T23:14:47","slug":"13238","status":"publish","type":"post","link":"https:\/\/www.acasinhadamatematica.pt\/?p=13238","title":{"rendered":"Duas circunfer\u00eancias conc\u00eantricas"},"content":{"rendered":"<p><ul id='GTTabs_ul_13238' class='GTTabs' style='display:none'>\n<li id='GTTabs_li_0_13238' class='GTTabs_curr'><a  id=\"13238_0\" onMouseOver=\"GTTabsShowLinks('Enunciado'); return true;\"  onMouseOut=\"GTTabsShowLinks();\"  class='GTTabsLinks'>Enunciado<\/a><\/li>\n<li id='GTTabs_li_1_13238' ><a  id=\"13238_1\" onMouseOver=\"GTTabsShowLinks('Resolu\u00e7\u00e3o'); return true;\"  onMouseOut=\"GTTabsShowLinks();\"  class='GTTabsLinks'>Resolu\u00e7\u00e3o<\/a><\/li>\n<\/ul>\n\n<div class='GTTabs_divs GTTabs_curr_div' id='GTTabs_0_13238'>\n<span class='GTTabs_titles'><b>Enunciado<\/b><\/span><\/p>\n<p><a href=\"https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2018\/01\/9V1Pag123-7.png\"><img loading=\"lazy\" decoding=\"async\" data-attachment-id=\"13239\" data-permalink=\"https:\/\/www.acasinhadamatematica.pt\/?attachment_id=13239\" data-orig-file=\"https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2018\/01\/9V1Pag123-7.png\" data-orig-size=\"225,215\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"Circunfer\u00eancias conc\u00eantricas\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2018\/01\/9V1Pag123-7.png\" class=\"alignright wp-image-13239 size-full\" src=\"https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2018\/01\/9V1Pag123-7.png\" alt=\"\" width=\"225\" height=\"215\" \/><\/a>Na figura est\u00e3o representadas duas circunfer\u00eancias de centro O e a corda [AC] tangente \u00e0 circunfer\u00eancia de raio menor em B.<\/p>\n<p>Justifica que \\(\\overline {AB} = \\overline {BC} \\).<\/p>\n<p><div class='GTTabsNavigation' style='display:none'><span class='GTTabs_nav_next'><a href='#GTTabs_ul_13238' onClick='GTTabs_show(1,13238)'>Resolu\u00e7\u00e3o &gt;&gt;<\/a><\/span><\/div><\/div>\n\n<div class='GTTabs_divs' id='GTTabs_1_13238'>\n<span class='GTTabs_titles'><b>Resolu\u00e7\u00e3o<\/b><\/span><!--more--><\/p>\n<p><a href=\"https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2018\/01\/9V1Pag123-7.png\"><img loading=\"lazy\" decoding=\"async\" data-attachment-id=\"13239\" data-permalink=\"https:\/\/www.acasinhadamatematica.pt\/?attachment_id=13239\" data-orig-file=\"https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2018\/01\/9V1Pag123-7.png\" data-orig-size=\"225,215\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"Circunfer\u00eancias conc\u00eantricas\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2018\/01\/9V1Pag123-7.png\" class=\"alignright size-full wp-image-13239\" src=\"https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2018\/01\/9V1Pag123-7.png\" alt=\"\" width=\"225\" height=\"215\" \/><\/a>A reta tangente a uma circunfer\u00eancia \u00e9 perpendicular ao raio dirigido ao ponto de tang\u00eancia.<br \/>\nLogo, os segmentos de reta [OB] e [AC] s\u00e3o perpendiculares.<\/p>\n<p>Considerando agora os tri\u00e2ngulos ret\u00e2ngulos [ABO] e [CBO], constata-se que [OB] \u00e9 um cateto comum e que as duas hipotenusas, [AO] e [CO], s\u00e3o iguais (pois s\u00e3o raios da mesma circunfer\u00eancia).<\/p>\n<p>Assim, o segundo cateto de cada um destes tri\u00e2ngulos ret\u00e2ngulos s\u00e3o tamb\u00e9m iguais entre si.<\/p>\n<p>Logo,\u00a0\\(\\overline {AB} = \\overline {BC} \\).<\/p>\n<p>Nota: O problema \u00e9 id\u00eantico a <a href=\"https:\/\/www.acasinhadamatematica.pt\/?p=13212\" target=\"_blank\" rel=\"noopener\">este<\/a>.<\/p><\/p>\n<div class='GTTabsNavigation' style='display:none'><span class='GTTabs_nav_prev'><a href='#GTTabs_ul_13238' onClick='GTTabs_show(0,13238)'>&lt;&lt; Enunciado<\/a><\/span><\/div><\/div>\n\n","protected":false},"excerpt":{"rendered":"<p>Enunciado Resolu\u00e7\u00e3o Enunciado Na figura est\u00e3o representadas duas circunfer\u00eancias de centro O e a corda [AC] tangente \u00e0 circunfer\u00eancia de raio menor em B. Justifica que \\(\\overline {AB} = \\overline {BC} \\). Resolu\u00e7\u00e3o &gt;&gt;&#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":20444,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[213,97,278],"tags":[426,457,188,282],"series":[],"class_list":["post-13238","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-9--ano","category-aplicando","category-circunferencia-e-poligonos","tag-9-o-ano","tag-arco-de-circunferencia","tag-circunferencia","tag-tangente-a-uma-circunferencia"],"views":5741,"jetpack_featured_media_url":"https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2018\/01\/9V1Pag123-7_520x245.png","jetpack_sharing_enabled":true,"jetpack_likes_enabled":true,"_links":{"self":[{"href":"https:\/\/www.acasinhadamatematica.pt\/index.php?rest_route=\/wp\/v2\/posts\/13238","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.acasinhadamatematica.pt\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.acasinhadamatematica.pt\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.acasinhadamatematica.pt\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.acasinhadamatematica.pt\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=13238"}],"version-history":[{"count":0,"href":"https:\/\/www.acasinhadamatematica.pt\/index.php?rest_route=\/wp\/v2\/posts\/13238\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.acasinhadamatematica.pt\/index.php?rest_route=\/wp\/v2\/media\/20444"}],"wp:attachment":[{"href":"https:\/\/www.acasinhadamatematica.pt\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=13238"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.acasinhadamatematica.pt\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=13238"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.acasinhadamatematica.pt\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=13238"},{"taxonomy":"series","embeddable":true,"href":"https:\/\/www.acasinhadamatematica.pt\/index.php?rest_route=%2Fwp%2Fv2%2Fseries&post=13238"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}