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椭圆的定义

Author:guomenglin

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算柱 (兩位數)
sanjiaohanshu
GeoGebra笔记功能体验课件
兩組對邊相等的四邊形
直角坐標平面上的旋轉變換

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testing2
任意三角形兩不等圓v3
四角柱體（長方體）的截面
全等—正方形的旋转
cos, sin 與單位圓的副本

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Cylinder
Equations
Parallelogram
Rectangle
Perimeter

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