1.3*pi = 4.08 units approx.
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The circumference of a circle with a diameter of 13 mm is: 40.84 mm
Circumference = (pi) x (diameter) = 13 pi = 40.84 ft(rounded)
Diameter of circle: 13/pi = 4 mm rounded to the nearest integer
Circumference = pi x diameter = pi x 13 = 40.84 feet or 40'10"
circumference = pi * diameterC = 3.14 * 13 = 40.82 inches