I tried plugging in numbers, such as r = 2, and I'm not sure why A isn't the answer. It looks like, for A, you would need to add the two radii (2+2), plug the base (2root3). B would just be 1/3(4pi).
What is incorrect in my thinking?
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- tommywallach
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Re: Guide 3, Chapter 5, Problem Set #13
You forgot that BC would also be part of the perimeter of the shaded region, not just arc BDC. 
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