已知如图AB=CD AE=CF BE=DF请证明AB∥CD

如图,已知ABⅡCD,OA=OD,AE=DF,求证：BEⅡCF. 已知AB=CD,BE=DF,AE=CF,问AB‖CD吗 如图 已知:ab∥cd ae⊥bd于e,cf⊥bd于f,be=df.说明ae=cd的理由. 如图AB=CD,BE=CF,AE=DF求证OA=OD 如图,已知在四边形ABCD中,AB=CD,BC=AD,E,F是对角线AC上两点,且AE=CF,证明BE=DF 已知：如图,AB＝CD,AE＝CF,BE＝DF.求证：AF∥CE 已知：如图,AB=CD,BC=DA,AE=CF.求证：DF=DE 如图,已知AB=CD,AE=CF,BE=DF.请说出∠EBF=∠EDF的理由 已知BC,EF交点O,AB//CD,OA=OD,AE=DF,求证BE//CF 如图,已知AE=CF,AD=BC,AB=CD,DF=BE.求证:(1)∠E=∠F;(2)∠1=∠2. 如图,已知AE=CF,AD=BC,AB=CD,DF=BE.求证：∠1=∠2 如图,已知AE=CF,AD=BC,AB=CD,DF=BE.求证角1=角2