The circumference is Pi multiplied by the diameter. In this case, the circumference is 18Pi. We can only approximate this since Pi is an irrational number. The circumference is about 56.55 inches.
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The circumference of a circle with a diameter of 18 inches is 56.5 inches.
A circle with a radius of 18 inches has a circumference of 113.097 inches.
Diameters don't have "circumference." If you want the circumference of a circle with diameter 18 in, then it is just pi*d = 18pi inches.
Circumference = 2 x pi x radius = pi x diameter where pi = 3.1416 Diameter = circumference / pi = 36/3.1416 = 11.46
All depends what you mean by 18 inches, is that the circumference, the diameter or the radius