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旋转曲面
Author:
Hello Math
GeoGebra
New Resources
龙形曲线-分形龙2
斐波那契螺旋弧线（表格法-可动态调节）
撒针估算面积实验
常见四边形是否是双心四边形
双心四边形
Discover Resources
相似三角形: 重溫
Version 2
Tangent to circle
对角线互相垂直的四边形，证倍分关系的副本
麻之葉
Discover Topics
Circumcircle or Circumscribed Circle
Tangent Function
Arithmetic Operations
Addition
Symmetry