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过圆上一点作切线，三步
Author:
u.jianwang
GeoGebra
New Resources
兩組對邊相等的四邊形
兩位數加法
畫出對稱圖形
三位數除以一位數（二）
錐體建築師
Discover Resources
滾動圓周來發現圓周長
Copy of Quadratic Graph - QESOSASS
切割正立方體
生长的海螺
莱洛三角形的互滚
Discover Topics
Arithmetic
Circle
Power Functions
Triangles
Differential Equation