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Tetrahedron 四面體
Author:
Steven S. H. Chu
GeoGebra
New Resources
球體建築師
畫出對稱圖形
球体的体积推导（优化版）
錐體建築師
找出對稱軸
Discover Resources
Quiz on Addition and Subtraction of Directed Numbers (2) 有向數加減測驗(2)
不規則圖形的周界(intro)
垂心與垂線
同心圓
Solve ax + b = cx + d
Discover Topics
Power Functions
Straight Lines
Complex Numbers
Ellipse
Real Numbers