ユークリッド空間の記事

If a region is not convex, a "dent" in its boundary can be "flipped" to increase the area of the region while keeping the perimeter unchanged.

等周不等式図形の周長と面積の数学的関係

等周不等式幾何学周長面積

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Illustration of a Cartesian coordinate plane. Four points are marked and labeled with their coordinates: (2, 3) in green, (−3, 1) in red, (−1.5, −2.5) in blue, and the origin (0, 0) in purple.

直交座標系（デカルト座標系）の基礎から応用まで

直交座標系デカルト座標解析幾何学x軸

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