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小正多边形在大正多边形内的滚动（边长不相等）
Author:
孟宝兴
GeoGebra
New Resources
四邊形的特性
兩組對邊相等和有直角的四邊形
判斷球體
球体的体积推导（优化版）
錐體建築師
Discover Resources
直角坐标
vector stack pile
DSE Circle-ACT01A Relationship between Chords and Centre of a Circle
二元线性规划的图解法(习题3)
与两圆都相切的动圆圆心的轨迹
Discover Topics
Continuity
Derivative
Cylinder
Indefinite Integral
Centroid or Barycenter