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正２０面体（黄金比）
Author:
Bunryu Kamimura
GeoGebra
New Resources
サイクロイド
正１７角形 作図 regular 17-gon 2
目で見る立方体の2等分
等積変形2
sine-wave
Discover Resources
五角形の重心と中点五角形
放物線とその焦点2
放物線と円
Group law on a cubic curve
扇形の回転体
Discover Topics
Incircle or Inscribed Circle
Ratios
Quadratic Equations
Plane Figures or Shapes
Standard Deviation