C=Pi times D.
42=Pi times D.
D= 42/Pi
Pi//\\//3.141593
Diameter= about 13.37
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13.375
Circumference = diameter*pi feet
About 131.95cm
Circumference = 42*pi feet or approximately 131.95 feet.
Circumference of a circle = (pi) x (diameter) = 42 pi = 131.947 feet (rounded)