复习题12
∵AB=BD,∴∠D=∠DAB=∠ABC/2=50°/2=25°,
∵AC=CE∴∠E=∠CAE=∠ACB/2=80°/2=40°
在△ADE中,∠DAE=180°-∠D-∠E=180°-25°-40°=115°