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賺賠：例2
Author:
GeoGebra Institute of Hong Kong
GeoGebra
New Resources
拼砌四邊形
球体的体积推导（优化版）
画直线等分三角形的面积
球體建築師
畫出對稱圖形
Discover Resources
等腰，角度关系
測試
Graph of Cosine
角度、弧度互換
纏繞畫2
Discover Topics
Diagrams
Sphere
Area
Terms
Arithmetic Operations