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Homework Help: Surface area of revolution for an ellipse

  1. Mar 10, 2008 #1
    1. The problem statement, all variables and given/known data

    Find the surface area obtained when the upper half of the ellipse: [tex]\frac{x^{2}}{4}+ y^{2}=1[/tex] is rotated about the x-axis

    2. Relevant equations
    [tex]\int2piyds[/tex]


    3. The attempt at a solution
     
  2. jcsd
  3. Mar 10, 2008 #2

    Dick

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    Science Advisor
    Homework Helper

    Please continue. ds=sqrt(1+(dy/dx)^2)*dy, correct?
     
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