Question 1132551
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I assume that the shaded area is between the circles.


Then its area is  {{{pi*R^2}}} - {{{pi*r^2}}} = {{{pi*(3r)^2}}} - {{{pi*r^2}}} = {{{9*pi*r^2}}} - {{{pi*r^2}}} = {{{8*pi*r^2}}}.     <U>ANSWER</U>
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Solved.