2. 外语
  3. The figure below shows two concentric circles, each with center O. Given that the larger circle has radius 12 and the smaller ci

The figure below shows two concentric circles, each with center O. Given that the larger circle has radius 12 and the smaller ci

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问题 The figure below shows two concentric circles, each with center O. Given that the larger circle has radius 12 and the smaller circle has radius 7, find the following.
(a)Circumference of the larger circle
(b)Area of the smaller circle
(c)Area of the shaded region
选项
答案(a)24π (b)49π (c)95π
解析
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