如图,已知AE⊥AD,AF⊥AB,AB∥CD,AF=CD,AE=AD,求证：AC垂直EF.

如图,已知AE⊥AD,AF⊥AB,AB∥CD,AF=CD,AE=AD,求证：AC垂直EF. 如图,已知AD//BC,AD=BC,AE⊥AD,AF⊥AB,AE=AD,AB=AF.求证：AC=EF. 如图,已知AE⊥AD,AF⊥AB,AB//CD,AE=CD,AE=AD,AF=CD,求证AC=EF 如图,已知AE⊥AD,AF⊥AB,AF=AB,AE=AD=BC,AD‖BC,求证AC⊥EF 如图,AD∥BC,AD=BC,AE⊥AD,AF⊥AB,且AE=AD,AF=AB,求证：AC=EF. 如图,已知AE⊥AD,AF⊥AB,AF=AB,AE=AD=BC,AD∥BC,求证：（1）AC=EF（2）AC⊥EF不用平行四边形 如图,已知AE⊥AD,AF⊥AB,AF=AB,AE=AD=BC,AD∥BC,猜想线段AC,EF的关系,并证明你 如图,AB‖CD,AD‖BC,AE⊥AB,AF⊥AD,AE=AB,AF=AD,试说明AC=EF 如图9,AD//BC,AE⊥AD且AE=AD,AF⊥AB且AF=AB.则AC与EF是否相等?为什么? 如图,已知AD⊥AB,AD⊥AC,AE⊥BC.D是FG的中点,AF=AG,EF=EG.求证：BC∥FG. 全等三角形证明题(初二上册)如图,已知AD为△ABC中线,AB⊥AE,AB=AE;AC⊥AF,AC=AF,求证：EF=2AD(注:未说AB=AC) 已知,如图,AB=AD,CB⊥AB,CD⊥AD,E,F分别是BC,DC的中点求证AE=AF急! 如图,已知：AD是△ABC的中线,AE⊥AC,AF⊥AB,且AE＝AC,AF＝AB试判断AD与EF的关系,并说明理由 已知如图 △ABC中,AD⊥BC于D DE⊥AB于E DF⊥AC于F 求证 AE:AF=AC:AB 已知AE⊥AD,AF⊥AB,AE=AD=BC,AD‖BC,求证:⑴AC=EF⑵AC⊥EF如题 如图,已知A.B.C.D在一条直线上,AB=CD,BE⊥AD,CF⊥AD,AE=DF.求证:AF=DE 如图,已知A、B、C、D在一条直线上,AB=CD,EB⊥AD,FC⊥AD,AE=DF.求证：AF=DE 如图,已知A、B、C、D在一条直线上,AB=CD,BE⊥AD,CF⊥AD,AE=DF.求证：AF=DE