C 2πr, π pi
r C/2π 10/2π 5/π 1.59...
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Circumference equals the diameter times pi. The diameter is 2 times radius. Radius equals Circumference divided by pi then divided by 2.
C = 113 inches.
The circumference of a circle equals the diameter times pi. The diameter is two times the radius. So a circle with a radius of 6 would have a diameter of 12, and a circumference of 12pi.
radius = 17/(2*pi) = 2.705634033 or 2.706 cm to 3 d.p.
The radius is 1/2 of the circumference.