Question

A circular swimming pool has a radius of 15 ft. There is a path all around that pool that is three feet wide. What is the circumference of the outer edge of the path around the pool?

Answer 1

To find the circumference of a circle you use the formula, C=2*pi*radius or C=pi*diameter, in his case you would use the first option, C=2*pi*radius, because the radius is the given value. You then plug the values into the equation to solve for the circumference...
C=2*pi*15
C=30*pi
C=30pi or approximately 94.2478