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过圆上一点作切线，三步
Author:
u.jianwang
GeoGebra
New Resources
兩位數加法
球體建築師
兩位數除以一位數（一）
判斷球體
兩組對邊相等的四邊形
Discover Resources
Area of Parallelogram
三棱锥的体积推导
angle 123
圓錐完成
gltzk 長方體表面的最短距離
Discover Topics
Differential Equation
Similar Triangles
Rectangle
Set Theory
Normal Distribution