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Area of a surface of revolution around the x-axis

  1. Sep 22, 2009 #1
    Can the Surface area of a revolution be NEGATIVE? I am calculating this in parametric equations?

    finally I hope this is the right forum to ask this question.
  2. jcsd
  3. Sep 22, 2009 #2


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    Science Advisor


    It is quite common for negative areas to show up in some context when you distinguish the inside and the outside of a surface. Depending on how you set up the formulae, you may have a case like this. Depending on what you are trying to find, you may need to alter the formula.

    Cheers -- sylas
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