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費馬點
Author:
kevin20020905
GeoGebra
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球体的体积推导（优化版）
画直线等分三角形的面积
三位數除以一位數（一）
畫出對稱圖形
兩位數加法
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clock
Task 3 Isosceles Triangle
Escher 階梯 (Penrose Stair)
垂心應用
两角和的余弦公式几何证明
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Root
Centroid or Barycenter
Linear Equations
Frequency Distribution
Orthocenter