來(lái)源:網(wǎng)絡(luò)資源 2022-04-14 22:31:32
用坐標(biāo)表示軸對(duì)稱
坐標(biāo)軸對(duì)稱
點(diǎn)P(x,y)關(guān)于x軸對(duì)稱的點(diǎn)的坐標(biāo)是(x,-y)
點(diǎn)P(x,y)關(guān)于y軸對(duì)稱的點(diǎn)的坐標(biāo)是(-x,y)
原點(diǎn)對(duì)稱
點(diǎn)P(x,y)關(guān)于原點(diǎn)對(duì)稱的點(diǎn)的坐標(biāo)是(-x,-y)
坐標(biāo)軸夾角平分線對(duì)稱
點(diǎn)P(x,y)關(guān)于第一、三象限坐標(biāo)軸夾角平分線y=x對(duì)稱的點(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y= -x對(duì)稱的點(diǎn)的坐標(biāo)是(-y,-x)
平行于坐標(biāo)軸的直線對(duì)稱
點(diǎn)P(x,y)關(guān)于直線x=m對(duì)稱的點(diǎn)的坐標(biāo)是(2m-x,y);
點(diǎn)P(x,y)關(guān)于直線y=n對(duì)稱的點(diǎn)的坐標(biāo)是(x,2n-y);
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