试解

来源: monseigneur 于 2024-01-21 11:01:10 [旧帖] [给我悄悄话] 本文已被阅读：次

Triangle ABO is isosceles. Angle AOB=360-(90+30+3*180/5)=132. So angle ABO=(180-132)/2=24. Angle ABC=24+30=54.

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