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Math Help - Surface Area

  1. #1
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    Surface Area

    I think I am getting the wrong equation! and I keep going over it and over it and keep getting the same. HELP PLEASE!


    Find the area of the surface generated by revolving the following curve about the axis:



    Area of the surface: .
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  2. #2
    Eater of Worlds
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    Are you using the correct formula. In parametrics, revolving about the x-axis, surface area is given by:

    2{\pi}\int_{0}^{\pi}rsin(t)\cdot\sqrt{r^{2}sin^{2}  (t)+r^{2}cos^{2}(t)}dt

    Which reduces to:

    2{\pi}r^{2}\int_{0}^{\pi}[sin(t)]dt

    Which gives the surface area of a sphere.
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  3. #3
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    Thanks a bunch! I forgot to write down the rsin(t)!!! BAH!
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