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Math Help - Volumes

  1. #1
    Newbie
    Joined
    Jan 2009
    Posts
    19

    Volumes

    Please help me on these 2 questions on volume. Thanks!

    1. y=1/x x=1, x=2, y=0

    2. y=x^2 x=[0,2], y=4, x=0
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  2. #2
    Newbie
    Joined
    Feb 2009
    Posts
    11
    Use method of disks.

    area=pi(radius squared)
    let the function y=1/x be the radius

    pi*integral(1/(x^2)) from 1 to 2= pi/2
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