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正9邊形
Author:
李春培
正9邊形
GeoGebra
New Resources
四邊形的特性
柱體建築師
画直线等分三角形的面积
異分母分數減法
三位數除以一位數（二）
Discover Resources
平行四邊形面積
扇形柱
空間貝氏曲線
Mathematics and Optics (and their applications)
球的内接三棱锥
Discover Topics
Geometric Transformations
Sine
Triangles
Equilateral Triangles
Hypergeometric Distribution