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Author:
John Tsang
GeoGebra
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撒针估算面积实验
龙形曲线-分形龙
第八周作业
双心四边形
常见四边形是否是双心四边形
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阿波羅尼斯問題：與三圓相切的圓
有人要告白嗎?
gdss
四邊形內多個四邊型旋轉
反射(鉛垂線、水平線及斜線) Reflection (vertical line, horizontal line and line)
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Geometry
Geometric Distribution
Perimeter
Volume
Distributions