求证:(1)△ABE≌△ADF
(2)∠AEF≌∠AFE
1.
∵菱形ABCD
∴AB=CD,∠B=∠C
∵BE=DF
∴△ABE≌△ADF
2.
∵BC∥AD BC=AD
∴◇AFCE
∴AE∥DF
∴∠AEF≌∠AFE