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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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Q: What is the circumference of an 18 feet diameter circle?
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