Perimeter of a semicircle is the length of the half-circle plus the diameter.
The whole circle would have a length of diameter times pi, but since it's only half...
Perimeter of semicircle = (1/2*pi*D) + D
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circumference or perimeter of the semi-circle = (diameter*pi)/2 + diameter
The circumference of a semicircle is pi times the radius plus the diameter.
The area would be 32*pi miles squared. The perimeter would be 16*pi miles.
The perimeter of a semicircle with radius R is pi*R + 2*R = R*(pi + 2)
it is the diameter