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正20面体

Author:2143550746

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美國國旗 (Codex 版)
畫出對稱圖形
兩組對邊相等的四邊形
算柱 (兩位數)
找出對稱軸

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圓底三角形截面
對稱
座標
正方形和長方形有甚麼特性？
密鋪

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Prism
Cylinder
Rotation
Ellipse
Means

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