∵∠DOE=5∠COE,∠DOE+∠COE=180°
∴∠COE=30°
∵OE垂直AB于O
∴∠EOB=90°
∵∠BOC=∠AOD且∠BOC=∠EOB+∠COE
∴∠AOD=∠EOB+∠COE=90°+30°=120°
∴∠AOD为120°