如图,已知AB⊥BC,DE⊥EF,AC=DF,BE=CF.求证:AC‖DF
如图,已知AB⊥BC,AE⊥EF,AC=DF,BE=CF.求证AC平行于DF.
如图,已知AB平行DE,AB=DE,BE=CF.求证:AC平行DF
如图,已知△ABC中,AB=AC,BE=CF.求证:DE=DF
已知如图 AB=AC,DE=DF,求证BE=CF
如图,AB=DE,AC=DF.BF=CF,求证AB//DE,AC//DF
如图,已知BE=DF,AC=CF,AE‖CF.求证:AD‖BC.
如图,已知AB=DE,AC=DF,BE=CF.求证:AC‖DF.
如图,已知:AB⊥BC于B,EF⊥AC于G,DF⊥BC于D,BC=DF.求证:AC=EF.
已知:如图,E,C是BF上两点,且BE=CF,AB=DE,AC=DF,求证:AB平行DE,AC平行DF
(1)已知:如图1,AB∥DE,AC∥DF,BE=CF.求证:AB=DE;
如图,在△ABC中,D为BC的中点,DE⊥DF交AB、AC于E、F,求证:BE+CF>EF.
已知,如图,AD=BC,AE=CF,BE⊥AC,DF⊥AC,垂足分别为E,F,求证;DF=BE