2. 外语
  3. The figure at the right consists of four semicircles in a large semicircle. If the small semicircles have radii of 1, 2, 3, and

The figure at the right consists of four semicircles in a large semicircle. If the small semicircles have radii of 1, 2, 3, and

admin2012-01-15  23
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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