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圆内接及外切正多边形

Author:张书真

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拼砌四邊形
錐體建築師
兩位數除以一位數（一）
直角坐標平面上的旋轉變換
兩組對邊相等的四邊形

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games
拼貼動畫
弧度制的由来
动点与函数图象1
动圆与两圆外切与内切(2)

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Equations
Combinatorics
Sphere
Confidence Interval
Centroid or Barycenter

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