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动圆在定圆上滚动
Author:
yhf
GeoGebra
New Resources
異分母分數減法
直角坐標平面上的旋轉變換
兩組對邊相等的四邊形
錐體建築師
三位數除以一位數（一）
Discover Resources
重複組合
碎形花瓣6
Rolling Square
人生宇宙
有趣的线
Discover Topics
Set Theory
Probability
Pythagoras or Pythagorean Theorem
Circumcircle or Circumscribed Circle
Unit Circle