求证DE=DF
如图,AB=DE,AC=DF.BF=CF,求证AB//DE,AC//DF
如图所示,AD垂直平分BC,DE⊥AB,DF⊥AC,垂直分别为E F,求证:DE=DF
如图,已知AB平行DE,AB=DE,BE=CF.求证:AC平行DF
如图,已知AB∥DE,AB=DE,BF∥CE.求证:AC∥DF
如图 已知AB=CD,AE=DF,CE=BF.求证:AF=DE
如图,已知AB=DC AE=DF .CE=BF 求证:AF=DE
如图AB=DC,AD=BC,DE=BF求证BE=DF
已知如图AB=DC,AE=DF,CE=FB求证AF=DE
如图,已知AB=DC,AE=DF,CE=FB,求证AF=DE
已知:如图,AD=BC,AB=CD,DE=BF求证:BE=DF
AB=DC.AE=DF.CE=BF.求证:AF=DE.
AB=DC,AE=DF,CE=FB,求证AF=DE