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Ebbinghaus illusion
Author:
acchu
GeoGebra
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正方形雪花图案
直線的斜率：水平變化 & 鉛垂變化
科氏力 (Coriolis Force)
平行線的判定
科赫雪花
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i love you
圓周
Shen Kuo Frustum
假分數轉為帶分數
六年級_截面_柱體_多邊形
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Translation
Arithmetic
Geometry
Power Functions
Percentages