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円の面積はなぜ半径を2回かけるのか？
Author:
T.Fujimaki
GeoGebra
New Resources
standingwave
アステロイド
standingwave-plus
二次曲線と離心率
standingwave-reflection
Discover Resources
円を折ってできる線の跡（包絡線）
図形と比 p152
リサージュ
点Pの存在範囲(ベクトル)
カフェウォール錯視
Discover Topics
Tangent Function
Vectors 3D (Three-Dimensional)
Power Functions
Quadrilaterals
Line Segment