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多边形与圆相互滚动
Author:
朱亮
GeoGebra
New Resources
兩位數除以一位數（二）
兩組對邊相等的四邊形
畫出對稱圖形
三位數除以一位數（一）
找出對稱軸
Discover Resources
托勒密定理推廣到任意四邊形二
線性變換對相關係數的影響
【物理】引力波
球面坐標
matrix of rotation transformation
Discover Topics
General Quadrilateral
Plane Figures or Shapes
Straight Lines
Centroid or Barycenter
Dilation