Just multiply the diameter times pi. Pi is approximately 3.1416.
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Circumference = pi * diameter. Pi is an "irrational" number (cannot be expressed as a fraction) whose length is infinitely long, but 3.1415 is generally close enough for practical purposes.
So, 18 * 3.1415 = 56.547 feet.
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The circumference of a circle is determined by multiplying the diameter (d) by the number pi. Therefore, the circumference of a circle with a diameter (d) of 18 feet is 18pi or 18x3.14159265358979323846... Roughly 56.54866776461627829228.
56.548667764616276 circumference = PI * diameter
d = 5.73 feet.
Diameter = 56.52/pi = 17.99087477 or about 18 feet
The circumference of a circle with a diameter of 18 inches is 56.5 inches.