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A circle with a radius of 5 feet has a circumference of 31.4 feet.
78.5 ft2(3.14)(5ft)2
5.0
.4r=5 r=5/.4 r=12.5 c=2pi(12.5) c=25pi ft
the formula to start off with is the circumference is pi x diameter therefore re-arranging the formula the diameter is the circumference divided by pi diameter = circumference / pi = 18ft 8in / 3.1415 = 5ft and 11 inches to the nearest inch (to be more precice to diameter is 5ft 11.3 inches--- note it is more difficult to work in feet and inches and easier to work in metres and centimetres)