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Math Help - Finding the area of a circle inscribed another circle

  1. #1
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    Finding the area of a circle inscribed another circle

    So here's the question and the highlighted answer.


    Here's what I did to solve it, but I don't come up with the correct answer. What am I doing wrong here?
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by thumpin_termis View Post
    So here's the question and the highlighted answer.


    Here's what I did to solve it, but I don't come up with the correct answer. What am I doing wrong here?
    You misread the question, the medalian is the colored glass + the frame, so r is the outer radius and r - s is the inner radius. thus your equation should be:

    A = \pi r^2 - \pi (r - s)^2
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  3. #3
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    Ah ha. I see. Now I get the correct answer. Thank you!
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