(如图,P4 9题)AC=AD,BC=BD,AB的延长线与CD交于点E.求证:AE⊥CD.
(如图,P4 9题)AC=AD,BC=BD,AB的延长线与CD交于点E.求证:AE⊥CD.
如图,AB=AC,BD=CD,AD的延长线与BC交于E,求证:AE⊥BC.
如图,AB=AC,EB=EC,AE的延长线交BC于D.求证BD=CD
如图,已知:AB‖CD,AC=BC,角ACB=90°,AB=BD,DB与CA的延长线相交于点E.求证:AD=AE
如图,已知:在△ABC中,点E,F分别在AB,AC上,且AE=AF,EF的延长线交BC的延长线于点D,求证:CD:BD=
如图,三角形abc中,点e,f分别在ab,ac上,且ae等于af,ef的延长线交bc的延长线于点d.求证:cd:bd=c
如图,BD为⊙O的直径,弦AC⊥BD,垂足为E,BA和CD的延长线交于点P.求证:(1)AB=BC.(2)CD·PC=P
如图,已知AB=AC,EB=EC,AE的延长线交BC于点D,求证:BD=CD
如图,BD为圆O的直径,弦AC⊥BD于点E,BA和CD的延长线交于点P,求证:(1)AB=BC,(2)CD.PC=PA.
已知,AB=AC,EB=EC,AE的延长线交BC于点D,求证BD=CD
如图,AD平分∠BAC,DE⊥AB于点E,DF⊥AC,交AC的延长线于点F,且BD=CD.
如图,已知AC⊥BD于C,CF=CD,BF的延长线交AD于点E,且AC=BC.