circumference = 6*pi inches
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Circumference is Pi x Diameter so do Circumference divided by Pi to get the diameter :)
r = 1/2d, where r is radius and d is diameter. C = d x pi, where C is circumference, d is diameter, and pi is 3.14159. r = 1/2 x 12in = 6in C = 12in x 3.14159 = 38in (rounded to two significant figures. (37.69908)
diameter = circumference/pi
circumference = diameter * pi. Therefore, diameter = circumference ÷ pi.
Circumference = pi*diameter So diameter = circumference/pi = 1.59 units