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椭圆的定义

Author:guomenglin

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兩組對邊相等和有直角的四邊形
畫出對稱圖形
四邊形的特性
柱體建築師
近似值：有效數字

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三角形的內角、外角、內角和與外角和
Locus: Fixed Distance From Fixed Point
橢圓的定義（by Jutor）
ppppp
兩組對邊相等的四邊形（三年級）

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Conic Sections
Vectors 2D (Two-Dimensional)
Geometric Mean
Quadratic Equations
Multiplication

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