A radius is not part of pi.
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radius = sq rt of (2122.64/pi) = 25.99340872 or about 26 units of measurement
Using 3.14 as Pi the area of circle is: 530.66
Area of a circle: pi times radius squared
2*pi*radius = circumference 2*pi*radius = 13 Making the radius the subject of the formula is: radius = 13/(2*pi) = 2.06901426 feet Check: 2*pi*2.06901426 = 13 feet
circumference = 2*pi*radius or pi* diameter