Question

如圖，將△ABC變換到△A′B′C′的位置，則你從圖中觀察發(fā)現(xiàn)下列說法正確的是

1. A.
   △ABC與△A′B′C′是關(guān)于x軸對(duì)稱的
2. B.
   △ABC與△A′B′C′是關(guān)于y軸對(duì)稱的
3. C.
   △ABC與△A′B′C′是關(guān)于點(diǎn)O對(duì)稱的
4. D.
   △ABC與△A′B′C′既關(guān)于x軸對(duì)稱，又關(guān)于y軸對(duì)稱

Answer 1

B
分析：根據(jù)軸對(duì)稱圖形的定義作答．
解答：∵各對(duì)應(yīng)點(diǎn)A和A′；B和B′；C和C'都在y軸兩側(cè)，
∴△ABC與△A′B′C′是關(guān)于y軸對(duì)稱．
故選B．
點(diǎn)評(píng)：找對(duì)稱軸需看對(duì)應(yīng)點(diǎn)在哪條直線的兩側(cè)．