The circumference of a circle with a 13-inch radius is: 81.68 inches (r x 2 x pi = circumference).
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A circle with a radius of 8 inches has a circumference of 50.27 inches.
Circumference = 2*pi*radius = 26*pi inches
The radius of a circle with a circumference of 13 feet is: 2.069 feet.
Circumference = 2*pi*rr(radius) = diameter/2 = 13 in/2 = 6.5 inch radiusCircumference = 2*pi(6.5 inches)= 41 inches in circumference===================
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.