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The figure shows two concentric circles, each with center O. The larger circle has radius 3r, and the smaller circle has radius 2r.


Quantity A
The area of the smaller circular region
Quantity B
The area of the shaded region
B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。