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circumference of a circle = 2*pi*radius or pi*diameter
Think of pi as infinity. It never ends. You might mean "3.14" as an approximation of pi, though.
pi can be useful in soccer because it can help determine the circumference of the soccer ball itself if you needed to know.
A circle within a square has a diameter equal to the side of the square = ' D '. Area of the square = D2 Area of the circle = pi R2 = pi (D/2)2 = pi/4 D2 Area inside the square but outside the circle = D2 - (pi/4 D2) = (1 - pi/4) D2 = 0.2146 D2(rounded)
circumference = {pi} x diameter circumference = {pi} x 24ft ~= 75.4ft