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圆的平移（平移加滑桿）
Author:
wanghailong
,
311016
GeoGebra
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直角坐標平面上的旋轉變換
sanjiaohanshu
兩組對邊相等和有直角的四邊形
兩組對邊相等的四邊形
找出對稱軸
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推移（y 方向）
說明用01
cos(π/n)cos(2π/n)cos(3π/n) ... cos(nπ/n) = ?
向外延伸的多邊形
答重庆杨志友椭圆的定义
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Angles
Difference and Slope
Addition
Functions
Variance