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正２０面体（黄金比）
Author:
Bunryu Kamimura
GeoGebra
New Resources
対数螺旋
斜めドップラー
コイン投げと樹形図
等積変形2
standingwave-reflection-fixed
Discover Resources
垂足円
平行線と角度
放物線と円
落下運動(2次関数の導入)
傍接楕円_3x2
Discover Topics
Ellipse
Distributions
Constructions
Optimization Problems
Arithmetic