已知,AE=CF,EO=FO,BE//DF,求证AB//CD
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,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:如图,平行四边形ABCD中,点E,F分别在CD,AB上,DF∥BE,EF交BD于点O,求证:EO=FO
如图所示,已知AB=CD,BE=DF,AE=CF,求证:OA=OC,OE=OF
已知AB=CD,BE=DF,AE=CF,问AB‖CD吗
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
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
已知:如图,AB=CD,AE=CF,BE=DF.求证:AF∥CE
如图,AB=CD,AE=CD,BO=DO,EO=FO,求证:OC=OA
如图,已知AB⊥BC,AE⊥EF,AC=DF,BE=CF.求证AC平行于DF.