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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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Line: 559
Function: get_footer
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Line: 315
Function: require_once
수학동아 - 폴리매스
함께 풀고 싶은 문제
창의력을 기를 수 있는 수학 문제 또는 퍼즐을 내는 곳입니다.
나는 π만
2020.01.01 06:59
조회 548
한 건축업자가 높이와 너비를 60cm로 하여 정사각형 창문을 만들었다.
블라인드나 커튼은 전혀 달지 않았다.
그런데 집주인이 빛을 2배로 들어오게 해달라고 했다.
그래서 건축업자는 높이와 너비를 전혀 바꾸지 않고 정사각형 창문을 고쳤다.
어떻게 한 걸까?
단, 여기서 빛에 영향을 주는 것은 넓이 뿐이다.
지금 바로
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