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<Text-field style="Heading 1" layout="Normal">eixo de simetria,</Text-field>
<Text-field style="Text" layout="Normal"><Font italic="true">n.</Font><Font encoding="UTF-8"> uma reta em torno da qual uma figura geom\303\251trica \303\251 sim\303\251trica, a line around which a geometric figure is symmetrical, para qualquer ponto </Font><Font bold="true">P</Font> da figura existe outro, <Font bold="true">P'</Font><Font encoding="UTF-8">, tal que as perpendiculares dos dois pontos \303\240 reta s\303\243o coincidentes e de igual comprimento. Por exemplo, um hex\303\241gono regular tem seis eixos de simetria, nomeadamente todos os bissetores dos seus \303\242ngulos e lados; o gr\303\241fico do cos(</Font><Font italic="true">x</Font>), como mostrado em</Text-field>
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<Text-field style="Text" layout="Normal">tem o eixo <Font italic="true">y</Font> como um eixo de simetria. Compare <Hyperlink linktarget="Dictionary:Definition/centerofsymmetry" hyperlink="true"><Font style="Dictionary Hyperlink" family="Times New Roman">centro de simetria</Font></Hyperlink>.</Text-field>
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