來(lái)源:網(wǎng)絡(luò)資源 作者:中考網(wǎng)整理 2019-05-29 21:56:59
中考數(shù)學(xué)沖刺知識(shí)點(diǎn):用坐標(biāo)表示軸對(duì)稱詳解
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);
歡迎使用手機(jī)、平板等移動(dòng)設(shè)備訪問(wèn)中考網(wǎng),2024中考一路陪伴同行!>>點(diǎn)擊查看