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圆扇形展开（解释面积公式）
Author:
朱亮
GeoGebra
New Resources
判斷球體
四邊形的特性
畫出對稱圖形
兩組對邊相等和有直角的四邊形
錐體建築師
Discover Resources
範例：丟骰子
Angle in Alternate Segment 2
重心 謝易昀
圖形的周界
异形操场
Discover Topics
Line Segment
Translation
Geometry
General Quadrilateral
Cylinder