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正三角形的旋轉2
Author:
李春培
正三角形的旋轉2
GeoGebra
New Resources
找出對稱軸
球體建築師
四邊形的特性
兩位數除以一位數（一）
四邉形 (四年級) 教師版
Discover Resources
Furstum
證平行四邊形 (對角相等)
volume of tetrahedron and parallelepiped
N-ellipse
S0E03 平面截立方体
Discover Topics
Numbers
Hypergeometric Distribution
Differential Calculus
Constructions
Pyramid