如图已知AB=AC,DF⊥BC,求证AD=AE
如图,已知AB⊥BC,AE⊥EF,AC=DF,BE=CF.求证AC平行于DF.
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BE=DF,AC=CF,AE‖CF.求证:AD‖BC.
已知:如图,AC/AD=AB/DE=BC/AE.求证AB=AE
已知:如图,EF‖BC,AE²=AD·AB.求证:DF‖EC.
已知:如图,EF‖BC,AE²=AD·AB.求证:DF‖EC.
如图,已知AE=AD,AB=AC,求证ED⊥BC
如图,已知AD//BC,AD=BC,AE⊥AD,AF⊥AB,AE=AD,AB=AF.求证:AC=EF.
已知,如图,AD=BC,AE=CF,BE⊥AC,DF⊥AC,垂足分别为E,F,求证;DF=BE
如图,已知AE⊥AD,AF⊥AB,AF=AB,AE=AD=BC,AD‖BC,求证AC⊥EF
已知:如图,AD/AB=AE/BC求证:AD/AE=DB/EC和AB/DB=AC/EC
如图,已知:df垂直ac,be垂直ac,ae等于cf,ab等于cd,求证:ad等于bc