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円の面積はなぜ半径を2回かけるのか？ver4

Author:T.Fujimaki

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円の伸開線
対数螺旋
二次曲線と離心率
等積変形2
standingwave-reflection-free

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アポロニウスのギャスケットその４
３つの円の相似の中心
数Ⅲ4step陰関数
円周角Inscribed angle
例２円錐の展開図

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Linear Equations
Inequalities
Triangles
Median Value
Random Variables

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