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题目内容
R and r are two radii of the larger and smaller circle, respectively, if the ratio of R to r is 3. The shaded region is what percentage of the larger circle?
Give your answer as a fraction.
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· 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。