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第17题题 求解答附带解释Thank you very much.

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第17题题 求解答附带解释Thank you very much.

 

第17题题 求解答附带解释Thank you very much.
因为 ∠AOC=1/5 ∠AOB
所以∠BOC=4/5 ∠AOB
因为OD平分∠BOC, 所以∠COD= 2/5 ∠AOB
因为 ∠COD 与 ∠AOC 互余,所以∠COD + ∠AOC= 90°
3/5 ∠AOB=90°
∠AOB=150°
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