已知AB=CD,BE=DF,AE=CF,问AB‖CD吗
已知AB=CD,BE=DF,AE=CF,问AB‖CD吗
AE=DF CE=BF AB=CD 问BE和CF平行吗?为什么?
如图,已知ABⅡCD,OA=OD,AE=DF,求证:BEⅡCF.
已知BC,EF交点O,AB//CD,OA=OD,AE=DF,求证BE//CF
已知,AE=DF,BF=CE,AE//df,问ab=cd吗?说明理由.
已知,AE=DF,BF=CE,AE//DF,问AB=CD吗
1.已知,AE=DF,BF=CE,AE‖DF,问AB=CD吗?说明理由.
如图所示,已知AB=CD,BE=DF,AE=CF.那么,AO和CD,EO和FO分别相等吗?为什么?
如图所示,已知AB=CD,BE=DF,AE=CF,求证:OA=OC,OE=OF
如图AB=CD,BE=CF,AE=DF求证OA=OD
如图所示,已知AB=CD,BE=DF,△ABE全等于△CDF,求证;AB平行CD,AE平行CF
如图 已知:ab∥cd ae⊥bd于e,cf⊥bd于f,be=df.说明ae=cd的理由.