Question

如图,OC是∠AOB的平分线,∠BOD=1/3∠COD,∠BOD=15°,则∠COD=_____,∠BOC=____,∠

Answer 1

解由∠BOD=1/3∠COD

即∠COD=3∠BOD=3×15°=45°

又由∠BOD=15°

则∠BOC=∠COD-∠BOD=45°-15°=30°

又由OC是∠AOB的平分线

则∠AOC=∠BOC=30°