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Author:
黃斌
GeoGebra
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圓的切線方程
撒针估算面积实验
常见四边形是否是双心四边形
第八周作业1
折扣
Discover Resources
正方形分割
同心多邊形
谢尔宾斯基三角形
随机模拟实验（撒豆子估算π）的副本
打包成jar包后，不能使用3D视图3D view cannot be used after it is packaged into a jar bag
Discover Topics
Incircle or Inscribed Circle
Function Graph
Quadrilaterals
Calculus
Orthocenter