Mathematics
Senior High

この図形の α の角度の求め方教えて下さい!
点Oは△ABC外心です。
答えは130°になるみたいです。

Answers

△ACDは二等辺三角形なので∠ADC=∠ACD=65°
∠ADB=115°
∠BOD=50°
よって∠α=130°

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