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If the diameter is known, don't bother measuring the circumference.Simply multiply the diameter by 'pi'.
circumference = pi*diameter so diameter = circumference/pi = 19.1 metres.
Circumference = (pi) x (diameter) = 14 pi = 43.9823 inches (rounded)
Diameter of circle: 13/pi = 4.138 ft to 3 decimal places
Just over 25' ( 8 x pi)