謝辞
英語の編集については Editage (www.editage.com) に感謝します。
[1] Stack Exchange Mathematics, Area of cyclic polygon maximum when it is a regular polygon, https://math.stackexchange.com/questions/1919440/area-of-a-cyclicpolygon-maximum-when-it-is-a-regular-polygon, last accessed on 2023-02-02.
[2] Stack Exchange Mathematics, Given a polygon of n sides, why does the regular one (i.e. all sides equal) enclose the greatest area given a constant perimeter?, https://math.stackexchange.com/questions/868026/given-a-polygon-of-nsides-why-does-the-regular-one-i-e-all-sides-equal-encl, last accessed on 2023-02-02.