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12 feet. The diameter of a circle is twice its radius.
If the radius is 8 feet then the diameter will be 16 feet.
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 !