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Function: driver

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Function: _error_handler

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Function: model

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Function: getFloatingMyInfo

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Line: 559
Function: get_footer

File: /volume1/web/PhpstormProjects/www_polymath_co_kr/index.php
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Function: require_once

수학동아 - 폴리매스
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[창의 퍼즐] [기하]교점삼각형
△π 2020.05.21 02:27 조회 659
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페이스북 트위터 카카오톡 카카오스토리 네이버블로그 네이버밴드

삼각형 ABC의 외접원의 각 호 BC, CA, AB의 중점을 D, E, F라 하자. 점 A에서 직선 DB, DC로 내린 수선의 발들을 지나는 직선을 la라 하자. 점 D에서 직선 AB와 AC로 내린 수선의 발들을 지나는 직선을 ma라 하자. 직선 la와 ma의 교점을 A1이라 하자. 마찬가지로 B1과 C1을 정의하자. 이때 삼각형 DEF와 A1B1C1이 닮음을 보여라. 

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