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旋轉對稱 Rotational symmetry

Author:TANG TSZ YUEN

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画直线等分三角形的面积
兩組對邊相等和有直角的四邊形
【案例】2013年安徽高考15题
球體建築師
兩組對邊相等的四邊形

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複合棒形圖_接疊
梯形堆垛
frustum by Mr LO WY
拋物線3--平行四邊形法
推移（y 方向）的副本

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Hypothesis Testing
Logarithmic Functions
Expected Value
Integral Calculus
Matrices

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