如图,AB⊥AD,AB=AD且AE=AC,DE=BC
如图,AB=AD,BC=DE,且BA⊥AC,DA⊥AE,
已知:如图,AC/AD=AB/DE=BC/AE.求证AB=AE
如图,AD∥BC,AD=BC,AE⊥AD,AF⊥AB,且AE=AD,AF=AB,求证: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,AB/AD=BC/DE=AC/AE,求证:∠BAD=∠CAE
如图,AB=AC,AD=AE,请说明DE//BC的理由.
如图,已知AB=AC,DE‖BC,试说明:AD=AE.
如图,△ABC中,AB=AC,D在BA的延长线上,E在AC上,且AD=AE,试说明:DE⊥BC
如图,已知AB/AD=AC/AE=BC/DE,试说明:AB*EC=AC*BD
已知:如图,AB/AD=AC/AE=BC/DE,求证,AB乘EC=AC乘BD
如图,已知AD//BC,AD=BC,AE⊥AD,AF⊥AB,AE=AD,AB=AF.求证:AC=EF.
如图,AD平行BC,AE垂直AD,AF垂直AB,且AE=AD,AF=AB,则AC与EF是否相等?为什么?