That depends on what is meant by 38 mi but the circumference of any circle is 2*pi*radius or diameter*pi
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Diameter = Circumference/pi = 38/pi = 12.1 inches
circumference
The circumference of 8,000 is: 25,130.
The circumference of a 36 circle is: 113.1 (diameter x pi = circumference).
Circumference isn't squared OR cubed. However, Surface Area is squared and so is Area. So Circumference is just Circumference :)