因为：AB=CD AE=DF EB⊥AD FC⊥AD所以：BE=CF因为：EB⊥AD FC⊥AD BE=CF所以：EF//BC因为：BE=CF AB=CD AE=DF EB⊥AD FC⊥AD所以：∠AEB=∠DFC因为：EF//BC EB⊥AD FC⊥AD∠AEB=∠DFC所以：∠AEF=∠DFE因为：∠AEF=...