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例题2（P点可拖动）
Author:
杜洋
GeoGebra
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拼砌四邊形
畫出對稱圖形
兩組對邊相等和有直角的四邊形
画直线等分三角形的面积
算柱 (兩位數)
Discover Resources
Polygonal numbers
正方體
Copy of 阿波羅尼斯圓
勾股定理的毕氏证明
正方體展開(動畫脫鉤).ggb
Discover Topics
Calculus
Tree Diagrams
Interest Calculation
Isosceles Triangles
Definite Integral