Posted by Sergio on Friday, October 24, 2008 at 12:50pm.
Since diagrams do not show up, I can only guess that they probably showed the shaded area as a ring or resembling a metal washer.
take area of large circle - area of small circle
= pi(R^2) - pi(R-3)^2
expand the second term, then simplify.
See if it matches one of the answers.
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