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If the radius is 8 feet then the diameter will be 16 feet.
It is not clear whether the circumference is 9 feet and you want the radius or diameter, or you have either the radius or diameter - which is 9 ft - and you want the circumference. The formulas are Circumference = 2*pi*r = 2*pi*d where r is the radius, d the diameter, and pi is the mathematical constant approximated by 3.14159
Diameter = 2 * radius So in this case, 40 feet.
The radius would be 4 feet I know this because the diameter is always 2x the size of the radius.
If the radius is 18 feet - then the diameter is 36 feet. The circumference measurement is irrelevant !