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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
GeoGebra
New Resources
カージオイド
斜めドップラー
フーリエ級数展開
standingwave-reflection
二次曲線と離心率
Discover Resources
ism1031b
回転体（②円）
おうぎ形
Parabolas and straight lines(放物線と直線)
円の極線の調和点列
Discover Topics
Tangent Line or Tangent
Special Points
Plane Figures or Shapes
Area
Centroid or Barycenter