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Homework Help: Cylindrical Shell Method

  1. Jan 17, 2010 #1
    Im new to finding volume using the cylindicral shell method so what should i do. I know I will eventually plug equations into the integral 2piX(f(x)-g(x))dx

    x=y x+2y=3 and y=0 revolve about the x axis
  2. jcsd
  3. Jan 17, 2010 #2


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    Draw a picture of the region. Now visualize what the shells are going to look like around the region. Then take your formula and think of it as 2*pi*(radius of shell)*(length of shell)*d(radius of shell). If you are rotating around the x-axis, which variable is a good choice for radius of shell. x or y?
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