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[学用] 勾股定理的几何原本证明
Author:
acchu
GeoGebra
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祖冲之的期望：内棋与外棋
多邊形的面積
撒针估算面积实验
双心四边形
正方形雪花图案
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test for 2nd view
Probability animation
Apollonius Problem 10 CCC wiki step 2
基础知识
三角函數圖形（全）的副本
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Rhombus
Solids or 3D Shapes
Rotation
Quadratic Functions
Means