This question has already been answered in detail and the answer is 38.83251825 or 39 inches to the nearest foot.
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The ratio of a circle's circumference to its diameter is a constant but irrational (meaning its precise value cannot be fully written out using traditional numbers) number called Pi (π). Pi ~= 3.1415927 Circumference = Pi (3.1415927...) * Diameter (120 inches) ~= 376.991118 inches ~= 377 inches
Estimate: 3*40 = 120 inches Actual: pi*39 = 122.5 inches to one decimal place
Circumference will be 120 pi inches, ie 31 feet and very nearly 5 inches
360 degrees in a circle 120 degrees = 12mm 360 degrees = 36mm Therefore the circumference of the circle is 36mm.
A central angle of 120 is one third of the circle, so the arc length of 28.61 is one third of the circumference. 28.61 X 3 = 85.83