Divide it by 3.145 or Pye.
Improved Answe:-
circumference = 2*pi*25
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Circumference = 2 * radius * pi So: 25(2) = 50 50 pi or about 157.1
The circumference of a circle if radius is 25 is about 157.1
Divide the circumference by 2PI to find the radius. ( C = 2PI*Radius)
Radius = Circumference/(2*pi) = 3.979 feet (approx)
find the radius of a circle with circumference of 42.1