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**1. Homework Statement**

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. Homework 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.

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