如图,已知BE=DF,AE=CF,AE∥CF,说明AB∥CD
如图 已知:ab∥cd ae⊥bd于e,cf⊥bd于f,be=df.说明ae=cd的理由.
已知:如图,AB=CD,AE=CF,BE=DF.求证:AF∥CE
如图,已知ABⅡCD,OA=OD,AE=DF,求证:BEⅡCF.
如图AB=CD,BE=CF,AE=DF求证OA=OD
已知:如图,AB=CD,BC=DA,AE=CF.求证:DF=DE
已知AB=CD,BE=DF,AE=CF,问AB‖CD吗
如图,已知A,C在EF上,AD=BC,AB=DC,AE=CF,则有BE∥DF,请说明理由
已知AB∥CD,AE∥CF,DE=BF.试说明:⑴AE=CF⑵AD∥BC
如图,已知BE=DF,AC=CF,AE‖CF.求证:AD‖BC.
如图,已知:AE∥CF且∠A=∠C,试说明:AB∥CD.
已知BC,EF交点O,AB//CD,OA=OD,AE=DF,求证BE//CF
如图,已知AD=CB,AE=CF,DE=BF,求证:AB∥CD