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Author:
高长乐
GeoGebra
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球体的体积推导（优化版）
四邊形的特性
拼砌四邊形
找出對稱軸
兩位數除以一位數（二）
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Area of cirle
畢氏定理
勝者即正義
GGB8
橢圓P176例11
Discover Topics
Circumcircle or Circumscribed Circle
Perimeter
Confidence Interval
Tree Diagrams
Sphere