{"id":5430,"date":"2010-11-14T12:29:41","date_gmt":"2010-11-14T12:29:41","guid":{"rendered":"https:\/\/www.acasinhadamatematica.pt\/?p=5430"},"modified":"2022-01-12T12:00:19","modified_gmt":"2022-01-12T12:00:19","slug":"considere-os-pontos-a-b-e-c","status":"publish","type":"post","link":"https:\/\/www.acasinhadamatematica.pt\/?p=5430","title":{"rendered":"Considere os pontos A, B e C"},"content":{"rendered":"<p><ul id='GTTabs_ul_5430' class='GTTabs' style='display:none'>\n<li id='GTTabs_li_0_5430' class='GTTabs_curr'><a  id=\"5430_0\" onMouseOver=\"GTTabsShowLinks('Enunciado'); return true;\"  onMouseOut=\"GTTabsShowLinks();\"  class='GTTabsLinks'>Enunciado<\/a><\/li>\n<li id='GTTabs_li_1_5430' ><a  id=\"5430_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_5430'>\n<span class='GTTabs_titles'><b>Enunciado<\/b><\/span><\/p>\n<p>Considere os pontos $A(5,1)$, $B(-3,2)$ e $C(3,-2)$.<\/p>\n<ol>\n<li>Escreva uma equa\u00e7\u00e3o cartesiana da reta que cont\u00e9m a altura do tri\u00e2ngulo [ABC] relativa a A.<\/li>\n<li>Calcule a \u00e1rea do tri\u00e2ngulo [ABC].<\/li>\n<\/ol>\n<p><div class='GTTabsNavigation' style='display:none'><span class='GTTabs_nav_next'><a href='#GTTabs_ul_5430' onClick='GTTabs_show(1,5430)'>Resolu\u00e7\u00e3o &gt;&gt;<\/a><\/span><\/div><\/div>\n\n<div class='GTTabs_divs' id='GTTabs_1_5430'>\n<span class='GTTabs_titles'><b>Resolu\u00e7\u00e3o<\/b><\/span><!--more--><\/p>\n<ol>\n<li>A reta pedida passa em A e \u00e9 perpendicular \u00e0 reta BC.\n<p>Como $\\overrightarrow{BC}=(6,-4)$, ent\u00e3o $\\overrightarrow{r}=(2,3)$ \u00e9 um vetor diretor da reta pedida.<\/p>\n<p>Assim, o declive da reta pedida \u00e9 $m=\\frac{3}{2}$, pelo que a sua equa\u00e7\u00e3o reduzida \u00e9 da forma $y=\\frac{3}{2}x+b$.<\/p>\n<p>Dado que o ponto A pertence a esta reta, temos $1=\\frac{3}{2}\\times 5+b\\Leftrightarrow b=-\\frac{13}{2}$.<\/p>\n<p>Logo, a equa\u00e7\u00e3o reduzida da reta pedida \u00e9 $y=\\frac{3}{2}x-\\frac{13}{2}$.<\/p>\n<p><strong>ALTERNATIVA<\/strong>:<br \/>\nDesignando por $P(x,y)$ um ponto gen\u00e9rico da reta pedida, os vectores $\\overrightarrow{AP}=(x-5,y-1)$ e $\\overrightarrow{BC}=(6,-4)$ ter\u00e3o de ser perpendiculares (ver anima\u00e7\u00e3o, abaixo).<\/p>\n<p>Logo, a reta pedida pode ser definida por: \\[\\begin{array}{*{35}{l}}<br \/>\n\\overrightarrow{AP}.\\overrightarrow{BC}=0 &amp; \\Leftrightarrow\u00a0 &amp; (x-5,y-1).(6,-4)=0\u00a0 \\\\<br \/>\n{} &amp; \\Leftrightarrow\u00a0 &amp; 6x-30-4y+4=0\u00a0 \\\\<br \/>\n{} &amp; \\Leftrightarrow\u00a0 &amp; 3x-2y-13=0\u00a0 \\\\<br \/>\n{} &amp; \\Leftrightarrow\u00a0 &amp; y=\\frac{3}{2}x-\\frac{13}{2}\u00a0 \\\\<br \/>\n\\end{array}\\]<br \/>\n\u00ad<\/p>\n<\/li>\n<li>Para determinarmos a altura do tri\u00e2ngulo relativamente ao lado [BC] necessitamos de determinar a proje\u00e7\u00e3o do ponto A sobre a reta BC, ponto A&#8217;.\n<p>Ora, o declive da reta BC \u00e9 ${{m}_{BC}}=\\frac{-2-2}{3-(-3)}=-\\frac{2}{3}$, que \u00e9 sim\u00e9trico e inverso do declive da reta pedida na al\u00ednea anterior, portanto estas retas s\u00e3o perpendiculares.<\/p>\n<p>Logo, a proje\u00e7\u00e3o do ponto A sobre a recta BC \u00e9 um dos pontos B ou C.<\/p>\n<p>Dado que apenas as coordenadas do ponto C verificam a equa\u00e7\u00e3o da recta pedida na al\u00ednea anterior, ent\u00e3o o ponto procurado \u00e9 C, isto \u00e9, o triangulo [ABC] \u00e9 ret\u00e2ngulo em C.<\/p>\n<p>Logo, \\[\\begin{array}{*{35}{l}}<br \/>\n{{A}_{[ABC]}} &amp; = &amp; \\frac{\\overline{BC}\\times \\overline{AC}}{2}\u00a0 \\\\<br \/>\n{} &amp; = &amp; \\frac{\\sqrt{{{(3+3)}^{2}}+{{(-2-2)}^{2}}}\\times \\sqrt{{{(3-5)}^{2}}+{{(-2-1)}^{2}}}}{2}\u00a0 \\\\<br \/>\n{} &amp; = &amp; \\frac{\\sqrt{52}\\times \\sqrt{13}}{2}\u00a0 \\\\<br \/>\n{} &amp; = &amp; \\frac{2\\sqrt{13}\\times \\sqrt{13}}{2}\u00a0 \\\\<br \/>\n{} &amp; = &amp; 13\u00a0 \\\\<br \/>\n\\end{array}\\]<\/p>\n<\/li>\n<\/ol>\n<p style=\"text-align: center;\">\u00ad<br \/>\n<script src=\"https:\/\/cdn.geogebra.org\/apps\/deployggb.js\"><\/script>\r\n<div id=\"ggbApplet\" style=\"margin: 0 auto;\"><\/div>\r\n<script>\r\nvar parameters = {\r\n\"id\": \"ggbApplet\",\r\n\"width\":883,\r\n\"height\":413,\r\n\"showMenuBar\":false,\r\n\"showAlgebraInput\":false,\r\n\"showToolBar\":false,\r\n\"customToolBar\":\"0 39 | 1 501 67 , 5 19 , 72 | 2 15 45 , 18 65 , 7 37 | 4 3 8 9 , 13 44 , 58 , 47 | 16 51 64 , 70 | 10 34 53 11 , 24  20 22 , 21 23 | 55 56 57 , 12 | 36 46 , 38 49  50 , 71 | 30 29 54 32 31 33 | 17 26 62 73 , 14 68 | 25 52 60 61 | 40 41 42 , 27 28 35 , 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is3D=is 3D applet using 3D view, AV=Algebra View, SV=Spreadsheet View, CV=CAS View, EV2=Graphics View 2, CP=Construction Protocol, PC=Probability Calculator, DA=Data Analysis, FI=Function Inspector, PV=Python, macro=Macro View\r\nvar views = {'is3D': 0,'AV': 1,'SV': 0,'CV': 0,'EV2': 0,'CP': 0,'PC': 0,'DA': 0,'FI': 0,'PV': 0,'macro': 0};\r\nvar applet = new GGBApplet(parameters, '5.0', views);\r\nwindow.onload = function() {applet.inject('ggbApplet')};\r\n<\/script><\/p>\n<div class='GTTabsNavigation' style='display:none'><span class='GTTabs_nav_prev'><a href='#GTTabs_ul_5430' onClick='GTTabs_show(0,5430)'>&lt;&lt; Enunciado<\/a><\/span><\/div><\/div>\n\n","protected":false},"excerpt":{"rendered":"<p>Enunciado Resolu\u00e7\u00e3o Enunciado Considere os pontos $A(5,1)$, $B(-3,2)$ e $C(3,-2)$. Escreva uma equa\u00e7\u00e3o cartesiana da reta que cont\u00e9m a altura do tri\u00e2ngulo [ABC] relativa a A. Calcule a \u00e1rea do tri\u00e2ngulo [ABC]. Resolu\u00e7\u00e3o &gt;&gt;&#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":19390,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[98,97,110],"tags":[422,67,111],"series":[],"class_list":["post-5430","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-11--ano","category-aplicando","category-geometria-analitica","tag-11-o-ano","tag-geometria","tag-vectores"],"views":2664,"jetpack_featured_media_url":"https:\/\/www.acasinhadamatematica.pt\/wp-content\/uploads\/2010\/11\/Considere_os_pontos_A_B_C.png","jetpack_sharing_enabled":true,"jetpack_likes_enabled":true,"_links":{"self":[{"href":"https:\/\/www.acasinhadamatematica.pt\/index.php?rest_route=\/wp\/v2\/posts\/5430","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=5430"}],"version-history":[{"count":0,"href":"https:\/\/www.acasinhadamatematica.pt\/index.php?rest_route=\/wp\/v2\/posts\/5430\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.acasinhadamatematica.pt\/index.php?rest_route=\/wp\/v2\/media\/19390"}],"wp:attachment":[{"href":"https:\/\/www.acasinhadamatematica.pt\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=5430"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.acasinhadamatematica.pt\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=5430"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.acasinhadamatematica.pt\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=5430"},{"taxonomy":"series","embeddable":true,"href":"https:\/\/www.acasinhadamatematica.pt\/index.php?rest_route=%2Fwp%2Fv2%2Fseries&post=5430"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}