volume of a cone = PI x R^2 X h/3
height = 18
so:
1014PI = PI x r^2 x 18/3
1014PI = PI x r^2 x 6
1014 = r^2 x 6
r^2 = 1014/6
r^2 = 169
r = sqrt(169) = 13
circumference = 2 X PI X R
circumference = 2 X 13 XPI
circumference = 26PI
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