Circumference = 10*pi = 31.416 feet rounded to three decimal places
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There is a problem here. A circle with a 7-foot diameter has a circumference of 21.99 feet, not 10 feet.If the circumference is 10 feet, that would make the diameter 3.183 feet.
Circumference is Pi x Diameter so do Circumference divided by Pi to get the diameter :)
diameter = circumference/pi
Circumference = pi*diameter So diameter = circumference/pi = 1.59 units
circumference = diameter * pi. Therefore, diameter = circumference ÷ pi.