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正二十面體
Author:
侯杰材
正二十面體
GeoGebra
New Resources
球体的体积推导
四邊形的特性
【案例】2013年安徽高考15题
柱體建築師
拼砌四邊形
Discover Resources
路徑一動畫
Angle at Centre Twice Angle at Circumference
找规律（数阵与点阵）
Hamid Naderi Yeganeh Ellipse1
橢圓1--四圓心近似法
Discover Topics
Perimeter
Set Theory
Sphere
Rhombus
Centroid or Barycenter