If the diameter of a circle is 15 feet, the circumference will be: 47.12 feet. (C = d x Pi)
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A circle with a radius (d/2) of 15 cm has a circumference of 94.2 cm
Circumference is pi * d. Solve for d. d = Circumference / pi
The circumference of 15 is: 47.12
Circumference = pi*d. So d = Circumference/pi
circumference = pi*d so it is a linear function. If d is multiplied by x, so is the circumference.