Question

如图,点A‘,B’,C‘,D’分别是正方形ABCD四条边上的点,且AA‘=BB’=CC‘=DD’,AB‘,BC’,CD‘

Answer 1

图形AA'BB'CC'DD'绕ABCD中心O旋转90º,A,A',B,B',C,C',D,D'分别到达B,B',C,C',D,D',A,A'.

AB'.BC',CD',DA'分别到达BC',CD',DA',AB'.,.

∴E,F,G,H分别到达,F,G,H,E

∴EF,FG,GH,HE分别到达,FG,GH,HE,EF

∴EF＝FG＝GH＝HE