GAUSS8 2014 Problem 21

Past Contests GAUSS8 GAUSS (GR. 8) - 2014
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1

The diagram shown consists of circles with radius 1\:cm and semi-circles with radius 1\:cm. The total shaded area, in cm^2, is

Image

Answer Choices
A. 10\pi
B. 9.5\pi
C. 9\pi
D. 8.5\pi
E. 8\pi