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过圆上一点作切线，三步
Author:
u.jianwang
GeoGebra
New Resources
三位數除以一位數（一）
算柱 (兩位數)
【案例】圆柱体内放置一个大球六个小球
直角坐標平面上的旋轉變換
畫出對稱圖形
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指數的對稱性
三角學
同心圓
Angle at centre twice angle at circumference
三圓外切
Discover Topics
Triangles
Matrices
Histogram
Division
Logic