정삼각형 ABC와 그 외접원 O가 있다.
이때, A를 지나는 직선은 BC와 점 D에서 만나고,
원 O와 점 E에서 만난다.
EC는 30이고, 호BP : 호PC는 1 : 3이면,
ABC외접원의 반지름은?
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