cir. of a circle is equals to pi xd.
hence,d=23/pi.
Taking pi to be 3.142,
d=7.32(3s.f)
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Diameter of circle: 13/pi = 4.138 ft to 3 decimal places
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.
Just over 25' ( 8 x pi)
19 pi, ie 19 x 3.1415 = 59.69