∠AOC=90°
∠AOB=30°
∠BOC=∠AOC-∠AOB=90°-30°=60°
∠BOD=60°+60°=120°
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∠AOC=90°
∠AOB=30°
∠BOC=∠AOC-∠AOB=90°-30°=60°
∠BOD=60°+60°=120°