You need to use the formula for solving the diameter of a circle which is C = pi * D = 3.1416 * 14 = 43.98 inches (approx)
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14 pi inches
circumference = pi*diameter so diameter = circumference/pi = 4.456 inches
Circumference = (pi) x (diameter) = 14 pi = 43.9823 inches (rounded)
Diameter = 14 inches => circumference = pi*14 = 43.98 inches.
Circumference = 2*pi*radius or circumference/2*pi = radius 90 inches/2*pi = 14 inches in radius =======================