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四顆外切球
Author:
林冠曄
GeoGebra
New Resources
直線的斜率
漂亮的摇摆曲线
空间中两直线的位置关系
球体的体积推导（优化版）
圓的切線方程
Discover Resources
Measurement & Classification of Angles 角的量度和分類
P2 Animated Clock
立體圖
三角形面積
橢圓軌跡
Discover Topics
Sphere
Planes
Trigonometry
Pythagoras or Pythagorean Theorem
Geometric Transformations