The figure below shows two concentric circles, each with center O. Given that th

游客2024-01-12  3

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
[br]

选项

答案 49π

解析
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