Diameters don't have "circumference." If you want the circumference of a circle with diameter 18 in, then it is just pi*d = 18pi inches.
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Circumference is Pi x Diameter so do Circumference divided by Pi to get the diameter :)
diameter = circumference/pi
circumference = diameter * pi. Therefore, diameter = circumference ÷ pi.
Yes because: circumference/diameter = pi and circumference = pi*diameter
Circumference = pi*diameter So diameter = circumference/pi = 1.59 units