來(lái)源:中考網(wǎng) 作者:紫涵 2012-11-09 15:26:07
坐標(biāo)軸對(duì)稱(chēng)
點(diǎn)P(x,y)關(guān)于x軸對(duì)稱(chēng)的點(diǎn)的坐標(biāo)是(x,-y)
點(diǎn)P(x,y)關(guān)于y軸對(duì)稱(chēng)的點(diǎn)的坐標(biāo)是(-x,y)
原點(diǎn)對(duì)稱(chēng)
點(diǎn)P(x,y)關(guān)于原點(diǎn)對(duì)稱(chēng)的點(diǎn)的坐標(biāo)是(-x,-y)
坐標(biāo)軸夾角平分線(xiàn)對(duì)稱(chēng)
點(diǎn)P(x,y)關(guān)于第一、三象限坐標(biāo)軸夾角平分線(xiàn)y=x對(duì)稱(chēng)的點(diǎn)的坐標(biāo)是(y,x)
點(diǎn)P(x,y)關(guān)于第二、四象限坐標(biāo)軸夾角平分線(xiàn)y= -x對(duì)稱(chēng)的點(diǎn)的坐標(biāo)是(-y,-x)
平行于坐標(biāo)軸的直線(xiàn)對(duì)稱(chēng)
點(diǎn)P(x,y)關(guān)于直線(xiàn)x=m對(duì)稱(chēng)的點(diǎn)的坐標(biāo)是(2m-x,y);
點(diǎn)P(x,y)關(guān)于直線(xiàn)y=n對(duì)稱(chēng)的點(diǎn)的坐標(biāo)是(x,2n-y);
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