What is the circumference of 15 FT?

The circumference of a circle is calculated using the formula ( C = 2\pi r ), where ( r ) is the radius. If you have a circle with a diameter of 15 feet, the radius would be half of that, which is 7.5 feet. Thus, the circumference would be ( C = 2\pi(7.5) \approx 47.12 ) feet.