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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
算柱 (兩位數)
兩位數除以一位數（二）
四邊形的特性
画直线等分三角形的面积
Discover Resources
Net of a cone
Angle at Centre & Angle at Circumference: Proof 圓心角與圓周角：証明
阿基米德螺線
可积准则
[洋葱] 与相似有关的最值问题-Q2
Discover Topics
Arithmetic
Centroid or Barycenter
Addition
Indefinite Integral
Hyperbola