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illusiion 6 平行线错觉
Author:
arist
GeoGebra
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中华人民共和国国旗
异形操场
活动三：应用性质
科赫雪花
第八周作业1
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圓外冪問題
等值分數圓餅圖
Epicycloid
时钟（序列文本）
光圈与正多边形外角和
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Integral Calculus
Trigonometry
Upper and Lower Sum or Riemann Sum
Quadratic Functions
Hyperbola