Question

20、如圖，利用關(guān)于坐標(biāo)軸對(duì)稱的點(diǎn)的坐標(biāo)特點(diǎn)，分別作出△ABC關(guān)于x軸和y軸對(duì)稱的圖形．

Answer 1

分析：由已知要作關(guān)于x軸和y軸對(duì)稱的圖形，即可以分別求出△ABC的對(duì)應(yīng)點(diǎn)，連接對(duì)應(yīng)點(diǎn)即可解決．

解答：解：作△ABC關(guān)于x軸對(duì)稱的圖形，即分別求出求出A的對(duì)應(yīng)點(diǎn)A″，C的對(duì)應(yīng)點(diǎn)C″，連接即可．作△ABC關(guān)于y軸對(duì)稱的圖形，即分別求出求出A的對(duì)應(yīng)點(diǎn)A′，B的對(duì)應(yīng)點(diǎn)B′，連接即可．

點(diǎn)評(píng)：此題主要考查了平面坐標(biāo)系中的對(duì)稱性，以及畫三角形只要找出對(duì)應(yīng)點(diǎn)即可．