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illusiion 6 平行线错觉
Author:
arist
GeoGebra
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撒针估算面积实验
科赫雪花
第八周作业3
斐波那契螺旋弧线（表格法-可动态调节）
第八周作业
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task2
Form 1(中一)
Apollonius Problem 10 CCC wiki
圓周 (圖形I)
比較利益
Discover Topics
Tangent Function
Definite Integral
Symmetry
General Quadrilateral
Cosine