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正20面体_3
Author:
ahhj45
GeoGebra
New Resources
正１７角形 作図 regular 17-gon
等積変形2
対数螺旋
二次曲線と離心率
目で見る立方体の2等分
Discover Resources
パップスの定理Pappus's Theorem
タンジェント（正接）の比
反射
true or false game
仕切られた水そう
Discover Topics
Natural Numbers
Statistical Characteristics
Real Numbers
Square
Rhombus