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动量守恒1--小球四分之一圆弧模型
Author:
高长乐
GeoGebra
New Resources
錐體建築師
球體建築師
異分母分數減法
兩組對邊相等的四邊形
球体的体积推导（优化版）
Discover Resources
区域面积
Angle between line and plane
周界
Angles formed by two straight lines and transversal
這是什麼角？的副本
Discover Topics
Conic Sections
Geometric Mean
Special Points
Centroid or Barycenter
Tangent Line or Tangent