Following the equation for a circumference, C being
C= pie. * d
This can be rearragend so d the diameter to be in terms r, raduis
C=pie. * 2r
This then can be rearraged to
r= C / (2*pie.)
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radius = circumference/2*pi
find the circumferance as if it was a whole circle but when you get the answer divide it by 2
divide the circumference by 3.14 to get the diameter - then divide that by 1/2 to get the radius Radius = Circumference / 2 x pi from C = Diameter x pi
The circumference is approximately 37.7 yards.
The circumferance is found by using the formula 2(r)(pi). r stands for the radius. The diameter, which is already given in the problem, is two time radius. Therefore the only thing you really have to do is multiple the diameter= 3 inches by pi. Circumferance is 9.425 inches.