AB=AC ∠ABC=∠ACB=72° CD平分∠ACD ∠BCD=∠ACD=36°DE//AC ∠ADE=∠AED=72°∠BDC=72° ∠ADC=108° ∠DEC=108° ∠EDC=36°△ADE与△ABC △CDB与△ABC △CED与△CDA (两角分别相等的三角形相似)——来自江西新余e百分的热心小尾巴
