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题目内容 （请给出正确答案）
单选题
A

4π+8

B

8π+4

C

8π+8

D

16π+4

E

16π+8

参考答案

参考解析
解析： The perimeter of the shaded region is the sum of the circumference of semicircle P and the length of diameter AB. Since AB = 7 - (-1) = 8, the diameter of circle P is 8, so, circumference semicircle P = 1/2 (πD)= (1/2) ×(8π)= 4π
Hence, the perimeter of the shaded region is 4π+8.
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