如图所示:BA⊥AC,DC⊥AC,AF=CE,BE=DF.求证;△ABE全等于△CDF,BE∥DF

如图所示:BA⊥AC,DC⊥AC,AF=CE,BE=DF.求证;△ABE全等于△CDF,BE∥DF 如图所示,已知三角形ABC中,AB=AC,F在AC上,在BA的延长线上取AE=AF,求证：EF⊥BC. 如图所示点ABC在同一条直线上BD⊥AC于B AE⊥DC于E BF=BC求证AF=DC 如图所示,点A,B,C在同一条直线上,BD⊥AC于B,AE⊥DC于E,BF=BC,求证AF=DC 如图所示,已知ae⊥ab,af⊥ac,ae=ab,af=ac.求证ec⊥bf 如图所示,AB=AC,DE⊥AC,BF⊥AC ,E.F是垂足,DE=BF求证AF=CE 如图所示,点A,B,C在同一条直线上,BD⊥AC于B,AE⊥DC于E,BF＝BC,求证：AF＝DC. 如图所示,已知△ABC中,AB=AC,F在AC上,在BA延长线上取AE=AF,求证:EF⊥BC添加辅助线AD⊥BC 已知:如图所示,在△ABC中,AB=AC E为AC上一点,ED⊥BC于点D,交BA的延长线于点F 求证：AE=AF 如图所示,已知AB⊥AC,AD⊥AE,AB=AC,AD=AE,求证：BE=DC 如图所示,已知AB⊥AC,AD⊥AE,AB=AC,AD=AE,求证：BE=DC非常急 如图所示,已知AE⊥AB,AF⊥AC,AE=AB,AF=AC.求证：（1）EC=BF；（2）EC⊥BF. 如图所示,已知AE⊥AB,AF⊥AC,AE=AB,AF=AC.求证①EC=BF②EC⊥BF. 如图所示,已知AE⊥AB,AF⊥AC,AE=AB,AF=AC.求证：（1）EC=BF；（2）EC⊥BF 如图所示,已知AE⊥AB,AF⊥AC,AF=AC,求证：（1）EC=BF（2）EC⊥BF 已知△ABC中,AB=AC,F在AC上,在BA的延长线上取AE=AF.求证EF⊥BC 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 在△ABC中,AB=AC,F是AC上任意一点,在BA的延长线上取AE=AF,求证EF⊥BC