{"id":5460,"date":"2010-11-14T22:00:39","date_gmt":"2010-11-14T22:00:39","guid":{"rendered":"https:\/\/www.acasinhadamatematica.pt\/?p=5460"},"modified":"2022-01-12T12:04:17","modified_gmt":"2022-01-12T12:04:17","slug":"equacao-da-recta-tangente-a-uma-circunferencia","status":"publish","type":"post","link":"https:\/\/www.acasinhadamatematica.pt\/?p=5460","title":{"rendered":"Equa\u00e7\u00e3o da reta tangente a uma circunfer\u00eancia"},"content":{"rendered":"<p><ul id='GTTabs_ul_5460' class='GTTabs' style='display:none'>\n<li id='GTTabs_li_0_5460' class='GTTabs_curr'><a  id=\"5460_0\" onMouseOver=\"GTTabsShowLinks('Enunciado'); return true;\"  onMouseOut=\"GTTabsShowLinks();\"  class='GTTabsLinks'>Enunciado<\/a><\/li>\n<li id='GTTabs_li_1_5460' ><a  id=\"5460_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_5460'>\n<span class='GTTabs_titles'><b>Enunciado<\/b><\/span><\/p>\n<ol>\n<li>Verifique que $A(1,-2)$ \u00e9 o ponto da circunfer\u00eancia C: ${{x}^{2}}+{{y}^{2}}-6x-2y-3=0$ e escreva uma equa\u00e7\u00e3o da reta tangente a C em A.<\/li>\n<li>Determine uma equa\u00e7\u00e3o da reta tangente \u00e0 circunfer\u00eancia de centro $D(3,4)$ no ponto $E(1,2)$.<\/li>\n<\/ol>\n<p><div class='GTTabsNavigation' style='display:none'><span class='GTTabs_nav_next'><a href='#GTTabs_ul_5460' onClick='GTTabs_show(1,5460)'>Resolu\u00e7\u00e3o &gt;&gt;<\/a><\/span><\/div><\/div>\n\n<div class='GTTabs_divs' id='GTTabs_1_5460'>\n<span class='GTTabs_titles'><b>Resolu\u00e7\u00e3o<\/b><\/span><!--more--><\/p>\n<ol>\n<li>O ponto A pertence \u00e0 circunfer\u00eancia C, pois as suas coordenadas verificam a sua equa\u00e7\u00e3o: ${{1}^{2}}+{{(-2)}^{2}}-6\\times 1-2\\times (-2)-3=0\\Leftrightarrow 1+4-6+4-3=0\\Leftrightarrow 0=0$.\n<p>A reta pedida \u00e9 perpendicular \u00e0 reta QA e passa por A, sendo Q o centro da circunfer\u00eancia.<\/p>\n<p>Como\u00a0${{x}^{2}}+{{y}^{2}}-6x-2y-3=0\\Leftrightarrow {{(x-3)}^{2}}-9+{{(y-1)}^{2}}-1-3=0\\Leftrightarrow {{(x-3)}^{2}}-9+{{(y-1)}^{2}}=13$, ent\u00e3o a circunfer\u00eancia tem centro em $Q(3,1)$.<\/p>\n<p>Ora, a reta QA tem declive ${{m}_{QA}}=\\frac{1+2}{3-1}=\\frac{3}{2}$, logo a reta pedida tem declive ${{m}_{t}}=-\\frac{1}{{{m}_{QA}}}=-\\frac{2}{3}$, sendo a sua equa\u00e7\u00e3o reduzida da forma $y=-\\frac{2}{3}x+b$.<\/p>\n<p>Como o ponto A pertence a esta reta, temos $-2=-\\frac{2}{3}\\times 1+b\\Leftrightarrow b=-\\frac{4}{3}$.<\/p>\n<p>Portanto, a equa\u00e7\u00e3o reduzida da reta pedida \u00e9 $y=-\\frac{2}{3}x-\\frac{4}{3}$.<\/p>\n<p><strong>ALTERNATIVA<\/strong>: Use o m\u00e9todo descrito em 2.<br \/>\n\u00ad<\/p>\n<\/li>\n<li>\n<p>Seja $P(x,y)$ um ponto gen\u00e9rico da reta pedida.<br \/>\nComo a reta tangente a uma circunfer\u00eancia \u00e9 perpendicular ao raio no ponto de tang\u00eancia, tem-se $\\overrightarrow{EP}.\\overrightarrow{DE}=0$ (ver anima\u00e7\u00e3o).<br \/>\nLogo, uma\u00a0condi\u00e7\u00e3o que define a recta pedida \u00e9: \\[\\begin{array}{*{35}{l}}<br \/>\n\\overrightarrow{EP}.\\overrightarrow{DE}=0 &amp; \\Leftrightarrow\u00a0 &amp; (x-1,y-2).(-2,-2)=0\u00a0 \\\\<br \/>\n{} &amp; \\Leftrightarrow\u00a0 &amp; -2x+2-2y+4=0\u00a0 \\\\<br \/>\n{} &amp; \\Leftrightarrow\u00a0 &amp; y=-x+3\u00a0 \\\\<br \/>\n\\end{array}\\]<\/p>\n<p><strong>ALTERNATIVA<\/strong>: Use o m\u00e9todo descrito em 1.<\/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\":864,\r\n\"height\":454,\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 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