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A circular pool of radius rfeet is surrounded by a circular sidewalk of width feet. In terms of r,what is the area of the sidewalk?

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A circular pool of radius rfeet is surrounded by a circular sidewalk of width <img alt='images' src='https://www.fatskills.com/images2/SAT/eq04726.png'/><!--<m:math display='inline' overflow='scroll' xmlns:m='http://www.w3.org/1998/Math/MathML'><m:mrow><m:mfrac><m:mi>r</m:mi><m:mn>2</m:mn></m:mfrac></m:mrow></m:math>--> feet. In terms of r,what is the area of the sidewalk?






 
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