如图,BE⊥AC,CD⊥AB,且AD=AE,求证:DF=EF.
如图,已知AB⊥BC,AE⊥EF,AC=DF,BE=CF.求证AC平行于DF.
如图,已知AD=BC,BE⊥AC于E,DF⊥AC于F,且BE=DF.求证AB‖CD
如图,AB⊥AC,AD⊥AE,AB=AC,AD=AE.求证BE⊥CD
如图,已知AE⊥AD,AF⊥AB,AB//CD,AE=CD,AE=AD,AF=CD,求证AC=EF
如图,已知AB是⊙O的直径,CD⊥AB,垂足为D,AE⊥AB,且AE=AC,BE交圆O于点F 求证:EF·EB=AD·A
如图,已知AB是圆O的直径,CD⊥AB,垂足为D,AE⊥AB,且AE=AC,BE交圆O于点F.求证:EF·EB=AD·A
如图,已知AE⊥AD,AF⊥AB,AB∥CD,AF=CD,AE=AD,求证:AC垂直EF.
如图,已知AB垂直AC,AD垂直AE,AB=AC,AD=AE,求证BE=CD且BE垂直CD.图在后面.
如图,AD∥BC,AD=BC,AE⊥AD,AF⊥AB,且AE=AD,AF=AB,求证:AC=EF.
如图,已知:AD=BE,AC=DF,且AC∥DF,求证:BC∥EF
已知:如图,AD=BC,AE=BE,∠A=∠B,DF=CF 求证:EF⊥CD
如图,AD是△ABC的中线,E、F分别在AB、AC上,且DE⊥DF 求证:BE+CF>EF.