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正方形和長方形有甚麼特性？
Author:
Anthony OR 柯志明
Eng version:
http://ggbtu.be/m79823
GeoGebra
New Resources
兩位數加法
空间中两直线的位置关系
探究三角形的全等條件
【案例】圆柱体内放置一个大球六个小球
画直线等分三角形的面积
Discover Resources
proof ASA
捷徑問題 2
旋轉的概念
angles in the same segment
圆周率π的收敛极快算法（代数几何方法）
Discover Topics
Incircle or Inscribed Circle
Planes
Surface
Hyperbola
LCM and GCD