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餘弦的定理
Author:
NG Chun Yee
GeoGebra
New Resources
祖冲之的期望：内棋与外棋
球体的体积推导
漂亮的摇摆曲线
多邊形的面積
球体的体积推导（优化版）
Discover Resources
畢氏定理的證明(三移動)
二次方程及其圖像
GeoGebra桌機版安裝
圆锥曲线1
第八周的作业
Discover Topics
Planes
Power Functions
Geometry
Numbers
Solids or 3D Shapes