延长CD与AB延长线交与M
AD平分∠BAC
AD⊥CM
∠ADM =∠ADc =90°
AD=AD
△ADM≌△ADC
CD=DM=1/2CM
∠M+∠MAD=90°
∠M+∠MCB=90°
∠MA D =∠MCB
∠ABC=∠MBC=90°
AB=BC
△ABE≌△MBC
AE=CM
CD=1/2AE
延长CD与AB延长线交与M
AD平分∠BAC
AD⊥CM
∠ADM =∠ADc =90°
AD=AD
△ADM≌△ADC
CD=DM=1/2CM
∠M+∠MAD=90°
∠M+∠MCB=90°
∠MA D =∠MCB
∠ABC=∠MBC=90°
AB=BC
△ABE≌△MBC
AE=CM
CD=1/2AE