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四角形の各辺の中点を結ぶと？

Author:小山英憲

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平均変化率
サイクロイド
接点の作る円は内接円
二次曲線と離心率
standingwave-reflection-fixed

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不連続の定義
random melody
アニメーション１０コマ１
sinの図形的意味《Omae》
等積変形

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Intersection
Diagrams
Logarithmic Functions
Parallelogram
Constructions

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