1. The problem statement, all variables and given/known data 2. Relevant equations d = 2.5 c = pi*d = 7.854 velocity/s ?= c * 2 = 15.7079 3. The attempt at a solution Since PR is 1/4 of the circle and the particle moves around the circle 2 times per second, I thought the average velocity would be 1/8th of the velocity that it's traveling. I'm really confused on this one. EDIT: I only need to solve for (a), that's why I only have data pertaining to that. Not worried about B and C, but any intuition on those is welcome.