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수학동아 - 폴리매스
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[기하] 피타고라스의 정리의 발견
수학동아 2018.12.27 20:41 조회 1403
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기원전 2550년, 고대 이집트의 사막도시 기자에서 많은 사람들이 엄청난 크기의 피라미드를 짓느라 부산스럽다. “매듭이 있는 줄을 가져와.” 줄잡이의 말에 한 인부가 매듭이 12개 묶여 있는 긴 줄을 가져왔다. 일정한 간격으로 매듭을 만든 뒤에 각 변에 매듭이 3개, 4개, 5개가 되도록 삼각형 모양을 만들면 직각을 잴 수 있는 자가 된다. 이 매듭 자 속에는 직각삼각형의 비밀, 피타고라스의 정리가 있다.

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#직각삼각형 #피타고라스의정리 #피타고라스나무 #구고현의정리
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