1. The problem statement, all variables and given/known data Find Cos B Hint: use trigonometry + Geometry http://img210.imageshack.us/img210/4596/pow.png [Broken] 2. Relevant equations trigonometry + Geometry 3. The attempt at a solution I dont see how i could use trig to find any of the angles, and since none of the lins go through the center it doesnt help me find the raudius. I dont even know how to begin solving this.