Diameter.
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Radius time 2 equals the diameter.
9. Circumference equals 2 times Pi times the radius. C=2(pi)r. "r" for radius. So if your circumference is 18 times pi, then you do 18 divided by 2, which gives you a radius of 9.
NO!!!! C = 2 pi r C = pi d In words ; Circumference equals two times 'pi' times radius or , circumference equals 'pi' times diameter. NB The diameter is twice the radius. Also A = pi r^(2) In words, Area equals 'pi' times the radius squared. Read learn and comit to memory these two circle equations.
2 times pi times the radius squared plus 2 times pi times the radius times the height equals surface area of a cylinder :]
The circumference of a circle equals 2 times pi times the radius, in this case, about 31.42 inches.