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Three concentric circles (the largest circle, the middle circle, and the smallest circle) form three areas (the most outer area S, the middle area R, and the most inner area Q). If S=5R, and the radius of the middle and the smallest circle is 30 and 10, respectively, then what is the radius of the largest circle?
70 显示答案
· 相关考点
4.5.2 圆的周长与面积
4.5.2 圆的周长与面积
以上解析由 考满分老师提供。
