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正四面體
Author:
侯杰材
正四面體
GeoGebra
New Resources
兩組對邊相等和有直角的四邊形
拼砌四邊形
兩位數加法
球体的体积推导（优化版）
畫出對稱圖形
Discover Resources
內切圓滾動
Quiz on Scientific Notation 科學記數法：測驗
線性組合2 三角形
test
密铺图形
Discover Topics
Tree Diagrams
Scatter Plot
Right Triangles
Matrices
Continuity