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拼砌多邊形
Author:
Tree
GeoGebra
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双心四边形
球体的体积推导（优化版）
垂直線的斜率
多邊形的面積
直線的斜率
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閱讀鐘面及數字鐘（時和分）
Circle Properties
[問題] x² + 2xy + y² + 5x + ay + b > 0
兩直線+圓
圓 點 直線 的複本
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Hypothesis Testing
Means
Incircle or Inscribed Circle
Diagrams
Root