1. The problem statement, all variables and given/known data A cyclist is initially heading exactly due North. He then initiates a turn to the West, the turn being a quarter circle with radius 12-m. He travels at a constant speed of 5.5-m/s during the turn. What is the direction of this average acceleration, measured anti-clockwise from East? 2. Relevant equations Theta=S/r Where s is arc length. 3. The attempt at a solution 0.25*2*12*Pi/12=1.57 This value seems way too small. Am I suppose to apply tan inverse to it which gives me 57 degrees?