It is: 2*pi*8 = 50.265 feet rounded to three decimal places
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The answer depends on whether 8 foot refers to the radius or diameter.
If the radius of a circle is 8 feet the circumference is about 50.27 feet.
If the radius of the circle is 8 cm the circumference is: about 50.27 cm (r x 2 x pi = circumference).
2 x pi x 8 ft = 50.265 ft
A circle with a radius of 8 inches has a circumference of 50.27 inches.