已知AB=AC,BD=CD,求证DE=DF

已知AB=AC,BD=CD,求证DE=DF 如图所示,已知AB=AC,BD=CD,DE⊥AB交AB延长线与E,DF⊥AC交AC延长线与E.求证DE=DF 如图,AB=AC,BD=CD,DE⊥AB于点E,DF⊥AC于点F.求证:DE=DF 如图,AB=AC,BD=CD,DE⊥AB于E,DF⊥AC于F,求证DE=DF, 已知：如图,AB=BD,AC⊥CD,AB=AC.求证：BD=CD 已知AB⊥BD,AC⊥CD,AB=AC,求证BD=CD 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 已知,如图所示,AB=CD,BF⊥AC,DE⊥AC,AE=CF.求证：BD平分EF 如图,已知AB⊥BD,AC⊥AB,AB=AC,求证:BD=CD 已知：如图,AD是△ABC的角平分线,DE⊥AB,DF⊥AC,垂足分别是E、F,BD=CD.求证:(1)△BDE≌△CD 如图,AB=DE,AC=DF.BF=CF,求证AB//DE,AC//DF