The circumference of a circle with the radius of 28 inches is 175.9 inches. (C = r x 2 x Pi).
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Circumference = 2 x PI x radius = 28 x PI = (approx) 87.9645943"
Circumference of the circle: 28*pi inches
Circumference = pi*diameter = 87.96 inches.
Thee formula for the circumference of a circle should read 2*pi*radius or pi*diameter. In which case using either formula its circumference is 88 inches rounded.
You divide the diameter by two to get the radius (28 / 2 = 14)