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二面角
Author:
qianqianhouhou
二面角的概念，拖动A、E点改变半平面
GeoGebra
New Resources
找出對稱軸
畫出對稱圖形
球體建築師
錐體建築師
兩位數除以一位數（一）
Discover Resources
梯形
Measure of Dispersion
Copy of 學生自行製作棒形圖
圓的面積的副本
用向量找北极星
Discover Topics
General Quadrilateral
Histogram
Normal Distribution
Random Experiments
Circumcircle or Circumscribed Circle