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Math Help - percent chance

  1. #1
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    percent chance

    Bobby and Joan are playing darts using the board shown below. The radius of the outside circle is 10in., and each of the other circles has a radius 2 in. smaller than the next larger circle. All of the circles have the same center. Bobby has only 1 dart left to throw and needs at least 30 points to win the game. Assuming that his last dart hits at a random point within a single region on the board, what is the percent chance that Bobby will win the game?
    Attached Thumbnails Attached Thumbnails percent chance-untitled.jpg  
    Last edited by mr fantastic; March 19th 2010 at 05:54 PM. Reason: I assume chanCe, not chanGe was meant
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  2. #2
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    P(10 or more points) = 1? I'm not sure that's entirely clear from the description.

    You will need the area of two circles, one with a 10 in radius and one with a 6 in radius. That's all.

    Let's see what you get.
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  3. #3
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    It's really 36%? It just seems wrong..
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