单选题A4π+8B8π+4C8π+8D16π+4E16π+8
单选题
A
4π+8
B
8π+4
C
8π+8
D
16π+4
E
16π+8
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.
Hence, the perimeter of the shaded region is 4π+8.
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