The circumference is Pi x r x r.... In THIS case it's .25 x .25 x Pi... which equals 0.19634375
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The circumference of a circle if radius is 25 is about 157.1
Radius = Circumference/(2*pi) = 3.979 feet (approx)
Circumference = 2 * radius * pi So: 25(2) = 50 50 pi or about 157.1
Divide it by 3.145 or Pye.Improved Answe:-circumference = 2*pi*25
157 ft