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正四面體交角
Author:
lamanleung
GeoGebra
New Resources
找出對稱軸
判斷球體
錐體建築師
拼砌四邊形
【案例】2013年安徽高考15题
Discover Resources
因式分解測驗
多邊形周界A
四點距離最小
卡瓦列里原理
斐波那契螺旋弧线（表格法-可动态调节）
Discover Topics
Correlation
Combinatorics
Cube
Perimeter
Random Experiments