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testing2
Author:
iedc
GeoGebra
New Resources
圓的基本性質
球体的体积推导（优化版）
漂亮的摇摆曲线
空间中两直线的位置关系
双心四边形
Discover Resources
Net of a cone
長方形面積法 _單項式乘法
单晨整体迭代希尔伯特皮亚诺(HilbertPeano)
劉虹圻 旁心
一次函数经过象限操作
Discover Topics
Surface
General Quadrilateral
Difference and Slope
Kite
Equilateral Triangles