2. 职称英语
  3. The figure at the right consists of four semicircles in a large semicircle. If t

The figure at the right consists of four semicircles in a large semicircle. If t

游客2025-02-24  55
问题 The figure at the right consists of four semicircles in a large semicircle. If the small semicircles have radii of 1, 2, 3, and 4, what is the perimeter of the shaded region?
选项 A、10π
B、20π
C、40π
D、60π
E、100π
答案 B
解析
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