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Function: require_once

수학동아 - 폴리매스
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[창의 퍼즐] [기하]정삼각형임을 잘 이용해보자
로보카폴리 2020.10.21 10:44 조회 573
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페이스북 트위터 카카오톡 카카오스토리 네이버블로그 네이버밴드

한변의 길이가 4cm인 정삼각형 ABC가 있다. 각 A의 각의 이등분선과 선분 BC의 교점을 D라하고 점 D에서 선분 AB,AB에 내린 수선의 발을 각긱 E,F라고 하자. 그리고 선 AB의 연장선과 선분 FD의 연장선의 교점을 Y, 선분 AC의 연장선과 선분 ED의 연장선의 교점을 X라고 하자. 이때 선분 XY의 길이를 구하시오.

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      로보카폴리 Lv.11 2021.07.10 22:34 비밀댓글
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