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Math Help - Surface area integral?

  1. #1
    gl7
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    Surface area integral?

    ok so i have worked out this problem and i am getting a crazy number

    here is the question:

    find surface area of paraboloid z = x^2 + y^2 cut off by plane z = 9?


    my solution is (74 \pi *sqrt(37) / 12 )- ( \pi /6)

    can someone check my ans please it would help me so much

    sorry if hard to read having trouble with it
    Last edited by mr fantastic; May 16th 2011 at 11:50 PM. Reason: Title.
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  2. #2
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    And how do you get this answer?
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  3. #3
    gl7
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    using \iint \sqrt{fx^2+fy^2+1} da
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  4. #4
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    74/2= 37. Other than that, I get the same answer you do.
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  5. #5
    gl7
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    thanks alot was just unsure with that crazy number
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