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volume of tetrahedron and parallelepiped
Author:
johnmayhk
GeoGebra
New Resources
兩位數加法
GeoGebra笔记功能体验课件
兩位數除以一位數（一）
兩組對邊相等和有直角的四邊形
第八周作业
Discover Resources
數學題目的模型
Angry Bird
外心的位置
旋轉正方形
连续开方（制作：谢建华，修订：孟宝兴）
Discover Topics
Rhombus
Rectangle
Equilateral Triangles
Kite
Centroid or Barycenter