Answer :
given:
radius= 18 miles
to find:
the circumference of the circle.
solution:
[tex]c = 2\pi \: r[/tex]
[tex]c = 2 \times 3.14 \times 18[/tex]
[tex]c = 113.04[/tex]
[tex]c = 113\: miles[/tex]
hence, the circumference of the circle is 113 miles.