17.9936 inch
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The circumference of a circle if the radius is 18 is: 113i have the same question and its multiple choice and none of the choices say 113! :((
C = 113
18 yards
Circ = 2 pi r = 60pi = 60 x 355/113 = 188.5" to one significant figure
If the radius is 18 feet - then the diameter is 36 feet. The circumference measurement is irrelevant !