The circumference of a circle divided by its own diameter will leave you with pi which is about 3.142 correct to three decimal places.
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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)
Well to do this you have to master the art of algebra :) C= π (pie) x Diameter Diameter= Circumference/π (pie) (C divided by Pie)..........we need to have D on its own so we do the opposite of multiply on the pie to get diameter on its own. ∴ D= C/π (pie)
Diameter of circle: 13/pi = 4.138 ft to 3 decimal places