C = 113 inches.
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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.
Circumference = 2Π• radius 2Π•9 = (18×Π)"≈ 56.5"
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.
A circle with a radius of 9 inches has a circumference of 56.55 inches and a diameter of 18 inches.
radius = 17/(2*pi) = 2.705634033 or 2.706 cm to 3 d.p.