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Author:
julyyy
GeoGebra
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直角坐標平面上的旋轉變換
三位數除以一位數（二）
找出對稱軸
判斷球體
柱體建築師
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用面積逼近圓周率
畢氏定理的證明
正n邊形與圓上點的中點軌跡(解析)
圆的面积展开的副本
作线段和角
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Area
General Quadrilateral
LCM and GCD
Secant Line or Secant
Probability