Circumference of a Circle The circumference of any circle, or the distance around the circle, can be determined using either of these formulas: C=md =2r y = radius d= d = 2r Applying Circumference The London Eye is a Ferris wheel that, at its highest point, stands 135 meters tall. The diameter of the London Eye is 120 meters. A person rides the wheel two full traveled? revolutions. How far has the person . Calculate the circumference. Use the button on your calculator. C=md C = C 377 m . Find the distance in two full revolutions. (377)(2)= m