The radius works out as 3.385137501 inches
So circumference = 2*pi*3.385137501 = 21.26944621or about 21.269 inches
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The radius of a circle with a circumference 36 inches is: 5.73 inches.
A circle with a radius of 18 inches has a circumference of 113.097 inches.
5.729"
d = 11.46 inches
Circumference = 2 x pi x radius = pi x diameter where pi = 3.1416 Diameter = circumference / pi = 36/3.1416 = 11.46