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分形几何欣赏初步：树型图
Author:
王俊辉
按逆时针方向，点选直角三角形直角边两点，构建新的图形。
GeoGebra
New Resources
球体的体积推导（优化版）
祖冲之的期望：内棋与外棋
圓的切線方程
球体的体积推导
画直线等分三角形的面积
Discover Resources
Angle Sum in a Triangle
World's Hardest Easy Geometry Problem.
阿基米德雙胞胎圓
Introduction to Trigonometry from a Unit Circle
正方体与球面的相交曲面
Discover Topics
Sphere
Multiplication
Binomial Distribution
Pythagoras or Pythagorean Theorem
Incircle or Inscribed Circle