(1)图中是通过绕点A旋转90°,使△ABE变到△ADF的位置;
(2)BE=DF,BE⊥DF 延长BE交DF于G,
由△ABE≌△ADF,得BE=DF,∠ABE=∠ADF
又∠AEB=∠DEG, ∴∠DGB=∠DAB=90°. ∴BE⊥DF