c=23.14r so first you would divide 13.5 by two to get the radius and you'd get 6.75. then you would plug the into the equation and get the equation c=23.146.75 . 23.14= 6.28 and 6.286.75= 42.39. so the perimeter/circumference is 42.39 meters
Sorry if its not right, but im 99.999999% sure it is so yeah
