The circumference of a circle equals the diameter * pi, where pi is a constant with an approximate value of 3.14. So, to answer your question, the circumference of your circle is about 6.283 inches.
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Circumference = 2*pi*radius or diameter*pi
Circumference of a circle: 2*pi*radius or diameter*pi
Circumference of a circle: 2*pi*radius or diameter*pi
Circumference of a circle = 2*pi*radius or pi*diameter
Circumference = 2*pi*rr(radius) = diameter/2 = 13 in/2 = 6.5 inch radiusCircumference = 2*pi(6.5 inches)= 41 inches in circumference===================