△ABE全等于△ADC
∠ACE=∠AEB
∵∠DPE=∠APC
∴∠a=∠DAC
∠1比角2比∠3=13比3比2
∠1=130°
设∠DAE=∠b
3∠1-∠b=360°
∠b=30°
∠a=∠1-∠b=100°