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November 24, 2014

November 24, 2014

Posted by **Sergio** on Friday, October 24, 2008 at 12:50pm.

- trig -
**Reiny**, Friday, October 24, 2008 at 12:56pmSince 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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