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對摺平行四邊形
Author:
hingchan
GeoGebra
New Resources
算柱 (兩位數)
錐體建築師
兩組對邊相等和有直角的四邊形
球体的体积推导（优化版）
判斷球體
Discover Resources
分數的大小變化
圖三
Similar triangles
Clown
空間中的平面與直線
Discover Topics
Right Triangles
Quadratic Equations
Upper and Lower Sum or Riemann Sum
Parametric Curves
Equations