Hi there! To find the circumference of a circle, you multiply pi and the diameter. The radius is 1/2 of the diameter and 6.5 * 2 is 13. The diameter is 13 meters. Multiply 13 by 3.14 to get the circumference. 13 * 3.14 is 40.82 or 40.8 when rounded to the nearest tenth. The circumference of the circle is 40.8 meters. The answer is C: 40.8 meters.