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Author:
Leo Chui
GeoGebra
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祖冲之的期望：内棋与外棋
画直线等分三角形的面积
圓的基本性質
多邊形的面積
直線的斜率
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angles sum of a triangle 1
固定周界長方形的面積變化（二）
qr code for symmetry
同心六邊形
劉徽的「割圓術」的副本
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Trigonometry
Division
Binomial Distribution
Calculus
Circumcircle or Circumscribed Circle