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例题2（P点可拖动）
Author:
杜洋
GeoGebra
New Resources
兩組對邊相等的四邊形
Fibonacci Clock
判斷球體
畫出對稱圖形
球體建築師
Discover Resources
sin&cos
立體形體 - (18)正方體的表面積計算
Is this a prism 3
圓心角
認識角度
Discover Topics
Conditional Probability
Ellipse
Cylinder
Perimeter
Unit Circle