Question

OC,OE分别是∠AOD,∠BOD的平分线,且∠AOB=150°,求∠COE的度数.

Answer 1

1)∠COE=∠COD+∠DOE

因为OE平分∠BOD,所以∠DOE=1/2∠BOD

因为OC平分∠AOD,所以∠COD=1/2∠AOD

最终∠COE=1/2（∠AOD+∠BOD）=1/2∠AOB=75°;