Find what it is in miles and multiply by 5280.
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you multiply the diameter by pi.
If the radius is 8 feet then the diameter will be 16 feet.
A circle with a circumference of 60 feet has a diameter of: 19.1 feet
If the radius (not raduis) is 25 feet then the diameter is 50 feet.
If the circumference of a circle is 20 feet the diameter is: 6.366 feet (circumference divided by pi = diameter).