just over 56½ inches (18 pi)
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Circumference of a circle: 2*pi*radius or diameter*pi
If the radius is 18 feet - then the diameter is 36 feet. The circumference measurement is irrelevant !
(pie)(diameter)=(circumference) (pie)(9)(2)=18(pie)=56.549
31.4 in
circumference = pi*diameter so diameter = circumference/pi = 4.456 inches