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Penrose Stair 1
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s10555047
GeoGebra
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龙形曲线-分形龙2
龙形曲线-分形龙
常见四边形是否是双心四边形
比較五件物件的重量
撒针估算面积实验
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動國旗
冥函数
正四角錐(旋轉，實體、透視)
纏繞畫2
exp(z)
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Arithmetic
Trigonometric Functions
Similar Triangles
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Orthocenter