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正二十面体辺切り
Author:
Naofumi Horio
GeoGebra
New Resources
目で見る立方体の2等分
sine-wave
standingwave
standingwave-reflection-free
正１７角形 作図 regular 17-gon 2
Discover Resources
等積変形_平行四辺形 のコピー
双曲線の作図
四角形の返上を動く点と三角形の面積
中点四角形の証明
方べきの定理
Discover Topics
Binomial Distribution
Conic Sections
Intersection
Vectors 3D (Three-Dimensional)
Fractal Geometry