The circumference of a circle with a diameter of 3 feet is 9.4 feet.
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The circumference of a circle with a 31 foot diameter is 97.4 feet, approx.
Circumference of the circle in feet = 24*pi Area of the circle in square feet = pi*122
Well, friend, in a 10-foot diameter circle, you would have a circumference of about 31.42 feet. This means if you were to straighten out the circle into a line, it would be about 31.42 feet long. Isn't that just a happy little fact to know?
If the circle is 5 feet around the circumference then there are 5 linear feet in the circumference. If you are asking what is the circumference of a circle with a 5 foot diameter then the answer is Pi x d
36 feet across, 18 feet from centre to circumference, or 113.1 ft (approx) around the circle.