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Perpendicular lines

Author:Ng KC

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判斷球體
兩組對邊相等的四邊形
畫出對稱圖形
直角坐標平面上的旋轉變換
柱體建築師

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Tractrix surface
盾牌
GGB作業
MFS: Rebound 1
对多边形对角线、内角和、外角和的理解

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Special Points
Logic
Hypergeometric Distribution
Prism
Orthocenter

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