Circumference = pi*diameter = 87.96 inches.
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Circumference of the circle: 28*pi 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.
If the area of a circle is about 28 square inches the diameter of the circle is: about 6 inches (5.971).
The circumference of a circle with the radius of 28 inches is 175.9 inches. (C = r x 2 x Pi).
It is: pi*28 meters