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<Text-field style="Heading 1" layout="Normal">coordenadas Cartesianas</Text-field>
<Text-field style="Text" layout="Normal">ou <Font bold="true">coordenadas retangulares</Font>, <Font italic="true">n.</Font><Font encoding="UTF-8"> um sistema para a representa\303\247\303\243o de um ponto no espa\303\247o em termos de sua dist\303\242ncia, medida sobre um um conjunto de </Font><Hyperlink linktarget="Dictionary:Definition/axis" hyperlink="true"><Font style="Dictionary Hyperlink" family="Times New Roman">eixos</Font></Hyperlink> mutuamente perpendiculares, de uma dada <Hyperlink linktarget="Dictionary:Definition/origin" hyperlink="true"><Font style="Dictionary Hyperlink" family="Times New Roman">origem</Font></Hyperlink>. No <Hyperlink linktarget="Dictionary:Definition/Cartesianplane" hyperlink="true"><Font style="Dictionary Hyperlink" family="Times New Roman">plano Cartesiano</Font></Hyperlink>, o ponto <Font family="MaplePi" encoding="UTF-8">\303\241</Font><Font italic="true">a, b</Font><Font family="MaplePi" encoding="UTF-8">\303\261</Font><Font encoding="UTF-8"> \303\251 localizado pela medida de </Font><Font italic="true">a</Font> unidades sobre o eixo-<Font italic="true">x</Font> e <Font italic="true">b</Font> undades sobre o eixo <Font italic="true">y</Font><Font encoding="UTF-8">, e ent\303\243o achando oponto de interse\303\247\303\243o de sua perpendicular aos eixos daqueles pontos. Como mostrado abaixo, </Font><Font italic="true">a</Font><Font encoding="UTF-8"> \303\251 ent\303\243o a </Font><Font italic="true">abscissa</Font> e <Font italic="true">b</Font> a <Font italic="true">ordenada</Font>.</Text-field>
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<Text-field style="Text" layout="Normal"><Font encoding="UTF-8">Por conven\303\247\303\243o, as dire\303\247\303\265es positivas dos eixos apontam para a direita e para cima, tal que os quatro pontos (<Font family="MaplePi">\302\261</Font></Font>1, <Font family="MaplePi" encoding="UTF-8">\302\261</Font><Font encoding="UTF-8">1) s\303\243o colocados como mostrado. O gr\303\241fico \303\251 dividido emquatro quadrantes. O primeiro </Font><Hyperlink linktarget="Dictionary:Definition/quadrant" hyperlink="true"><Font style="Dictionary Hyperlink" family="Times New Roman">quadrante</Font></Hyperlink><Font encoding="UTF-8"> \303\251 aquele cujas duas quantidades s\303\243o positivas. Os outros quadrantes s\303\243o numeredoa no sentido contrario do primeiro. Este sistema se estende naturalmente para tr\303\252s ou mais dimens\303\265es; em tr\303\252s dimens\303\265es a conven\303\247\303\243o \303\251 usar um conjunto de eixos orientado com a da forma </Font><Hyperlink linktarget="Dictionary:Definition/right-handed" hyperlink="true"><Font style="Dictionary Hyperlink" family="Times New Roman" encoding="UTF-8">m\303\243o direita</Font></Hyperlink><Font encoding="UTF-8"> e muitas f\303\263rmulas padr\303\243o pressup\303\264em isso. Veja tamb\303\251m </Font><Hyperlink linktarget="Help:changecoords" hyperlink="true"><Font style="Hyperlink" family="Times New Roman">changecoords</Font></Hyperlink>, <Hyperlink linktarget="Dictionary:Definition/coordinategeometry" hyperlink="true"><Font style="Dictionary Hyperlink" family="Times New Roman">geometria de coordenadas</Font></Hyperlink>.</Text-field>
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