Easy as pie... Get it? Sorry math joke. C = 2pi *r = pi * d , so... We know C = 13.5 , plug in the value for C in the equation to get 13.5 = pi * d , divide both sides by pi to get d = 13.5/pi. I don't have a calculator with me. Pi = 3.14
circumference = π x diameter => diameter = circumference ÷ π ~= 20ft ÷ 3.14 ~= 6.37 ft
The circumference of a circle with the diameter of 14 ft is: 44 feet.
The circumference of a circle whose diameter is 1.5 ft is: about 4.712 feet.
Circumference = (pi) x (diameter) = 13 pi = 40.84 ft(rounded)
About 6.28 ft. Multiply the diameter by pi- or 3.14, to get the circumference.