circumference = pi * diameter
C = 3.14 * 13 = 40.82 inches
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Circumference = 2*pi*rr(radius) = diameter/2 = 13 in/2 = 6.5 inch radiusCircumference = 2*pi(6.5 inches)= 41 inches in circumference===================
The circumference of a circle with a diameter of 13 mm is: 40.84 mm
The diameter of any circle is twice its radius. A circle with a radius of 13 inches will have 2 x 13 = 26 inches for a diameter.
A circle with a radius of 8 inches has a circumference of 50.27 inches.
Circumference = (pi) x (diameter) = 13 pi = 40.84 ft(rounded)