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Function: driver

File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/libraries/Cacher.php
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File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/controllers/ver3/Contents.php
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Function: model

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File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/libraries/Common.php
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Function: _error_handler

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Function: model

File: /volume1/web/PhpstormProjects/www_polymath_co_kr/application/libraries/Common.php
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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
Line: 315
Function: require_once

수학동아 - 폴리매스
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함께 풀고 싶은 문제
창의력을 기를 수 있는 수학 문제 또는 퍼즐을 내는 곳입니다.
[창의 퍼즐] [기하]X는 나가면 안돼!
△π 2020.05.02 15:59 조회 665
문제 푼 사람 0명
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페이스북 트위터 카카오톡 카카오스토리 네이버블로그 네이버밴드

n이 5 이상일 때, A,B는 O를 중심으로 하는 정 n각형의 이웃한 꼭짓점이다. 삼각형 XYZ는 처음에 OAB와 일치한 삼각형으로 시작했다가, 계속해서 OAB와 닮음을 유지한 채 움직인다. Y와 Z는 이 다각형의 둘레 전체를 움직이지만, X는 이 다각형 밖으로 나가면 안된다. X의 자취를 구하여라.

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