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Angle at centre twice angle at circumference
Author:
Big Lee
GeoGebra
New Resources
球體建築師
球体的体积推导（优化版）
異分母分數減法
找出對稱軸
畫出對稱圖形
Discover Resources
證平行四邊形 (對邊相等)
square and circle
巧虎_生活數學 對稱剪紙
拋物線
模拟龟兔画板
Discover Topics
Vectors 2D (Two-Dimensional)
Standard Deviation
Circle
Intersection
Geometry