An athelete completes one round of a circler track of radius R in 40S. The displacement of the athelete at the end of 20 min 20s is

First, find the speed of the athlete.

Second, find the distance the athlete has covered in 20 min 20 s.

Then, make a quick sketch of the track, and find the displacement from the starting point to his position at time 20 min 20 s. You should make use of angles here and probably use the cosine rule as well. Can you solve it?

Thank you very much for giving solution about the problem