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切割正二十面體
Author:
薛鈞聰
GeoGebra
New Resources
判斷球體
球体的体积推导
兩位數除以一位數（二）
球體建築師
兩位數除以一位數（一）
Discover Resources
圓周
ikik
錯角---不平行綫
劉虹圻 垂心
圓與切線
Discover Topics
Trigonometric Functions
Dilation
Stochastic Process or Random Process
Right Triangles
Cosine