The formula for a circumference is 2 times Pi times Radius. A diameter is twice the Radius, so the circumference is Diameter times Pi.
5 times Pi (3.14159) is approximately 15.70795.
Pi has an endless number of digits to the right of the decimal point, so the best we can do is approximate.
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The equation for determining the circumference of a circle is circumference = pi x diameter. So if the diameter is 5, then the circumference is pi * 5 = 15.71
Circumference = pi*diameter So diameter = circumference/pi = 1.59 units
The circumference of a circle with diameter D is πD where π = 3.14159 approx. So D = 5 gives a circumference of 15.7 cm
c = 15.7
About 1.6 inches.