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三等分点连线围成的三角形特征（唐老师）
Author:
龚洪萍
Topic:
Geometry
GeoGebra
New Resources
撒针估算面积实验
直線的斜率
正方形雪花图案
龙形曲线-分形龙
圓周公式的應用
Discover Resources
天干與地支
半角公式證明
Testing 20170308
DSE Circle-ACT05A Exterior Angle of a Cyclic Quadrilateral
正N边形点列
Discover Topics
Geometric Distribution
Equilateral Triangles
Upper and Lower Sum or Riemann Sum
Right Triangles
Centroid or Barycenter