circumference = pi*d so it is a linear function. If d is multiplied by x, so is the circumference.
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Circumference = pi*diameter.
To find the linear feet in a given diameter, you need to know the circumference (or perimeter) of the object. The formula to calculate the circumference is circumference = π × diameter. Without the circumference, it is not possible to determine the linear feet.
16.956/3.1416 = 5.397 linear units
12 x 3.1416 = 37.7 linear units
16*pi measured in linear units