diameter of the circle = 30/pi = 9.549 inches to 3 dp
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31.4 in
circumference = pi*diameter so diameter = circumference/pi = 4.456 inches
Diameter = Circumference/pi = 1.91 inches, approx.
Circumference = 37.7 inches Diameter = 12 inches
A circumference of 66.76 inches.