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Circumference 圓周
Author:
Alex CHIK
GeoGebra
GeoGebra 互動數學教室
http://www.geogebra.hk
New Resources
球体的体积推导（优化版）
三位數除以一位數（二）
畫出對稱圖形
判斷球體
錐體建築師
Discover Resources
Slope of perpendicular lines
test
正四面體反射面
三節棍
动态演示面动成体：圆柱、圆锥、圆台、球
Discover Topics
Plane Figures or Shapes
Interest Calculation
Linear Regression
Square
Equilateral Triangles