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Homework Help: Area of circle using integration

  1. Jan 13, 2016 #1
    1. The problem statement, all variables and given/known data
    2. Relevant equations

    http://postimage.org/] Screen_Shot_2016_01_13_at_8_14_51_PM.png [/PLAIN] [Broken]
    20mb image hosting

    3. The attempt at a solution

    Found width of that rectangle. Multiply times delta h. My question is, why is the integral from -3 to 3? When I try to evaluate the integral by going h(3) - h(-3) I get 0-0. If you use 3 or -3 for h you get 0. I don't understand how to evaluate this integral?
    Last edited by a moderator: May 7, 2017
  2. jcsd
  3. Jan 13, 2016 #2
    You go from -3 to 3 because from the picture, the center is h = 0. You'll have to show your work on the integral so we can evaluate it for errors.
  4. Jan 13, 2016 #3
    Ooops I forgot to take the actual integral. I was just plugging in h = -3 and h = 3 into that solution. Thanks.
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