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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
admin
2012-01-15
44
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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