DBCAEF全等三角形的判定(HL)练习题1.如图,已知AD为ΔABC的高,E为AC上一点,BE交AD于F,且BF=AC,FD=CD.求证:BE⊥AC2.已知:BA⊥BD,FD⊥BD,AB=CD,AC=CF求证:AC⊥FC.3.如图,在△ABC中,D是BC中点,DE⊥AB,DF⊥AC,垂足分别是E、F,AE=AF.求证:∠B=∠C21FEBDACDBAFCABCDEFDBAFC4.已知:如图,AC平分∠BAD,CE⊥AB于E,CF⊥AD于F,且BC=DC.求证:BE=DF.5.已知:BA⊥DC,FD⊥DC,∠ACF=90°,AB=CD.求证:BD+DF=AB6.如图10,已知AB=AD,AC=AE,∠ABC=∠ADE=90°,BC与DE相交于点F.求证:CF=EF.