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원에 내접하는 정n각형
원에서 정n각형만큼을 빼면 n이 커질수록 그 빈공간은 작아진다. 그래서 n이 커질수록 원에 가까워진다.
정다각형을 작도해보고 직접 눈으로 확인해봤는데 정7각형같이 작도가 되지 않는다고 배운것들을 작도할수있는게 놀라웠다