The circumference of a circle if the radius is 2 feet is: about 12.57 feet.
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A circle with a radius (d/2) of 2.1 feet has a circumference of 13.2 feet.
Its radius is: 17.27/(2*pi) in feet
Circumference of a circle = 2*pi*radius or diameter*pi Area of a circle = pi*radius squared
radius = 54/(2*pi)
radius in feet = 13/(2*pi)