Question

（10分）如圖，∠AOB＝∠COD＝90⁰,OC平分∠AOB，∠BOD＝3∠DOE
試求 ∠COE的度數(shù)。

Answer 1

解：∵∠AOB＝90⁰，OC平分∠AOB
∴∠BOC＝∠AOB＝45⁰                           .........3分
∵∠BOD＝∠COD-∠BOC＝90⁰-45⁰＝45⁰
             ∠BOD＝3∠DOE                                .........6分
∴∠DOE＝15⁰                                                                  .........8分
∴∠COE＝∠COD-∠DOE＝90⁰-15⁰＝75⁰                           .........10分解析:
p;【解析】略