physics help
posted by william .
An auto race is held on a circular track. A car completes one lap in a time of 16.9 s, with an average tangential speed of 48.1 m/s. Find the following
(a) the average angular speed
(b) the radius of the track
i found part a which was .3716 but need help with part b please

one lap in 16.9s? That is 2PI radians/16.9s which is the angular speed.
b. angularspeed*radius= tangential speed, find radius.