We need to find the surface area of the smaller circle, and the circle as a whole. The smaller circle has a surface area of 1809.56 when we use A=pi times r^2. Then we need the entire circle using the same formula. The surface area is 2642.08. We then subtract the smaller from the bigger we get 832.52. We then divide this by 4 giving us 209.
Mar 17th, 2015
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