Help... I don't understand this question..

Question

Reagon rides on a playground roundabout with a radius of 2.5ft. To the nearest foot, how far does Reagon travel over an angle of 4pi/3 radians?

Answer 1

4pi/3(2.5) = 10pi/3 =

10.4719 feet, about 10 feet

circumference of a circle =2rpi or diameter times pi

if r= 2.5, the circumference = 2(2.5)pi = 5pi

4/3pi = (2/3)5pi = (10/3)pi = about 10 feet

length of a sector = radius times the angle (measured in radians) = 2.5(4pi/3) = about 10 feet