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正四面體
Author:
明欣
正四面體
GeoGebra
New Resources
画直线等分三角形的面积
拼砌四邊形
球体的体积推导（优化版）
柱體建築師
判斷球體
Discover Resources
三條線上的正三角形
Quadratic Graph - QESOSASS
圆心角和圆周角
Incentre
小二均分
Discover Topics
Parallelogram
Vectors 3D (Three-Dimensional)
Kite
Arithmetic Mean
Right Triangles