Mathematics
Senior High

この2つの問題の解説をお願いします。
答えは(1)130°(2)115°です

2 下の図で,点Oが △ABCの外心であるとき,角0を求めよ。 (1) A (2) B、 B 65° 0 130° A # n t fish t p.86 p.88 形と比

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