如图,DE‖AC,DF‖AB,求证;△BDE∽△DCF
如图,AB=DE,AC‖DF,BC‖EF,求证:△ABC≌△EDF.
如图,在△ABC中,AB=AC,点D在BC上,DE‖AC交于点E,DF‖AB交AC于点F.求证:DE+DF=AB
如图,在△ABC中,D是BC的中点,DE‖AB,DF‖AC,DE,DF分别交AC,AB于点E,F求证:BF=DE,CE=
如图,已知AB=DE,AC=DF,BE=CF.求证:AC‖DF.
如图,已知AB‖CD,OA=OD,AE=DF,求证①△ABE≡△DCF②EB‖CF
如图,AB=DE,AC=DF.BF=CF,求证AB//DE,AC//DF
如图 AB//DE,AC//DF,BC//EF,求证△ABC全等于△DEF
如图,AB=DE,AC//DF,BC//EF,求证:△ABC≌△DEF
1.如图,AB=DE,AC//DF,BC//EF,求证:△ABC≌△DEF.
如图,已知△ABC中,AB=AC,BE=CF.求证:DE=DF
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
已知,如图,A,B,C,D四点在一条直线上,AC=BD,AE//DF,∠ABE=∠DCF,求证△ABE全等△DCF