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Perimeter

Author:Janice Wong, Anthony OR 柯志明

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拼砌四邊形
美國國旗 (Codex 版)
畫出對稱圖形
近似值：有效數字
判斷球體

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regular tetrahedron in a cube
GGB2
內擺線
省政信箱
海螺

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Sphere
Cosine
Kite
Inequalities
Mode

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