∠BOF=180°-∠AOF
=180°-120°
=60°
∵∠AOC=∠BOD=90°(对顶角相等)
∴∠COF=∠AOF-∠AOC=120°-90°=30°
∵∠DOE=∠COF=30°(对顶角相等)
∴∠EOC=180°-∠DOE
=180°-30°=150°
∠BOF=180°-∠AOF
=180°-120°
=60°
∵∠AOC=∠BOD=90°(对顶角相等)
∴∠COF=∠AOF-∠AOC=120°-90°=30°
∵∠DOE=∠COF=30°(对顶角相等)
∴∠EOC=180°-∠DOE
=180°-30°=150°