Find the circumference. Leave your answer in terms of pi.

The circumference of circle with radius 18 inches in terms of pi is 36π inches
From the given figure, radius "r" = 18 inches
We have to find circumference of circle
circumference would be the length of the circle if it were opened up and straightened out to a line segment.
The circumference of circle is given as:
[tex]\text {circumference of circle }=2 \pi r[/tex]
Where "r" is the radius of circle
Substituting the value r = 18 inches in above formula,
[tex]\text {circumference of circle }=2 \times \pi \times 18=36 \pi[/tex]
Thus circumference of circle in terms of pi is 36π inches