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

游客2024-01-12  16

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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