You can find the perimeter of a circle by using the radius.
circumference = 2 [tex] \pi r[/tex]
Circumference = 2 [tex] \pi x 12[/tex]
circumference = 24 pi
Since you are only trying to find half of the circle you would divide your answer by 2
24pi / 2 = 12 pi
12 pi = 37.68
The answer is B. 37.7
