如图8,已知:AE⊥AB,AF⊥AC,AE=AB,AF=AC.试证明:(1)CE=BF;(2)CE⊥BF

如图8,已知:AE⊥AB,AF⊥AC,AE=AB,AF=AC.试证明:(1)CE=BF;(2)CE⊥BF 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,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,AF=CD,AE=AD,求证：AC垂直EF. 已知：如图,AB=AC,AE=AF,AE⊥EC,AF⊥BF,则∠1=∠2吗?为什么? 已知:如图,AB=AC,AE=AF,AE⊥EC,AF⊥BF,则∠1=∠2吗?为什么? 已知,如图,在△ABC中,AB=AC,AE是C边上的中线,AF是∠CAD的平分线,求证:AE⊥AF 已知,如图,在△ABC中,AB=AC,AE是C边上的中线,AF是∠CAD的平分线,求证:AE⊥AF 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) 如图所示,已知ae⊥ab,af⊥ac,ae=ab,af=ac.求证ec⊥bf 已知如图 △ABC中,AD⊥BC于D DE⊥AB于E DF⊥AC于F 求证 AE:AF=AC:AB 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：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,在Rt△ABC中,∠C=90°,CD⊥AB,AE平分∠A,过E作AF‖BC求证:AF=AC 如图,AB‖CD,AD‖BC,AE⊥AB,AF⊥AD,AE=AB,AF=AD,试说明AC=EF 已知：如图△ABC中,AB=AC,在BA的延长线上及AC边上分别截取AE=AF.求证：EF ⊥ BC 如图,已知△ABC中,AB=AC,F在AC上,在BA的延长线上截取AE=AF,求证：ED⊥BC