수학동아 - 폴리매스

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함께 풀고 싶은 문제

창의력을 기를 수 있는 수학 문제 또는 퍼즐을 내는 곳입니다.

[창의 퍼즐] [기하]오각형을 10으로 나누면 2분의 1각형..?

켋 2020.06.10 08:02 조회 797

문제 푼 사람 0명

페이스북 트위터 카카오톡 카카오스토리 네이버블로그 네이버밴드

그림과 같이 한 변의 길이가 1인 정오각형을 다섯 개의 한 꼭짓점과 대변의 중점을 이은 선분으로 나누어 합동인 직각삼각형 10개를 만들었다.

$\frac{sin\frac{3}{5}\pi }{sin\frac{1}{5}\pi }=1.62, \sqrt{23700}=153$ 이라고 할 때, 직각삼각형의 빗변과 변의 길이가 2분의 1이 아닌 변의 길이의 차를 기약분수로 나타내었을 때,

분모와 분자의 차는 몇인가?

풀이 필수.

이전글 슬기로운 조합문제 IX[조합]

다음글 [집합] 갑, 을, 병

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