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Author:黃斌

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常见四边形是否是双心四边形
撒针估算面积实验
双心四边形
盈利與虧蝕
第三周作业效果演示

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固定三角形的條件−題4
rotational symmetry_4
正十二面體裁邊 (Chamfered Dodecahedron)
畫三角形第1題
圓周角與圓心角之度數關係臆測（圓心在圓周角的內部）

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Incircle or Inscribed Circle
Exponential Functions
Cosine
Vectors
LCM and GCD

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