Circumference = radius times pi
you can find the radius by dividing the diameter in half and multiplying that by 3.14
In this case it'd be
2.5 x 3.14 = circumference
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5
pi*diameter = 16 inches Divide both sides by pi to find the diameter: diameter = 5.092958179 or 5 inches to the nearest inch.
d = 1.59 inches
About 1.6 inches.
5 pi in or 15.7 in