1. The problem statement, all variables and given/known data http://img10.imageshack.us/img10/9651/mathhelp.jpg [Broken] RED was given, BLUE was what I was able to find. What is the area of the shaded part? 2. Relevant equations Area of shaded part = area of two triangles + area of sector 3. The attempt at a solution I was able to find the area of the two triangles easily enough, but I can't think of a way to find the the value of angle AOB without using a calculator. My idea was to find angles AOP and BOQ and subtract them from 180, but again, no calculators allowed.