Half it and so 22/2 = a radius of 11 inches
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Multiply the radius by 2 to get the diameter, then diameter times pi to get the circumference.C = (pi) D = (pi) 2rC = (3.1416) x [2 x 11] = (3.1416) x 22 = about 69.1 inches
If radius = 22 inches then circumference = 138.2 inches. If diameter = 22 inches then circumference = 69.1 inches. Please help us to help you by being clearer when you ask your question.
c = 22"
If the diameter is 112 inches then the radius is half that = 56 inches (assuming it's a circular object) The area is Pi times the Radius squared and lets approximate Pi to 22/7 as it works out nicely ;-) Radius = half the diameter 22/7 times 56 times 56 in square inches =9856 SQUARE INCHES to convert to square feet you divide 12*12 =144 9856/144 = 68.4444 SQUARE FEET
radisus: 11; diameter:22 (2X11)