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连续开方（制作：谢建华，修订：孟宝兴）
Author:
孟宝兴
GeoGebra
New Resources
Earth with coastline
判斷球體
兩組對邊相等的四邊形
找出對稱軸
美國國旗 (Claude 版)
Discover Resources
廣義角的代換(180度加減角度)
Copy of 固定周界的長方形的面積變化
勝者即正義，可愛即正義～(可用Ctrl+滑鼠滾輪放大界面)
anlge at centre twice angle at circumference
黃金矩形
Discover Topics
Congruence
Scatter Plot
Rectangle
Probability
Difference and Slope