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正九邊形
Author:
李春培
正九邊形
GeoGebra
New Resources
Fibonacci Clock
畫出對稱圖形
Nested spiral octagon
長方體平面投影 (Codex版)
近似值：有效數字
Discover Resources
圆锥曲线定义的拓展（卡西尼卵形线）
複合圖形(五)
圓柱曲面
长方形边线展开
Quiz on Addition and Subtraction of Directed Numbers (2)
Discover Topics
Vectors
Hypothesis Testing
Triangles
Upper and Lower Sum or Riemann Sum
Poisson Distribution