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A frustum of a right circular cone with height h, lower base radius R, and top radius

  1. Jan 20, 2012 #1
    1. The problem statement, all variables and given/known data

    A frustum of a right circular cone with height h, lower base radius R, and top radius r. Find it's volume.

    2. Relevant equations

    We are currently learning the Method of Washers and the Method of Cylindrical Shells so I believe we are supposed to use this somehow.

    3. The attempt at a solution

    Here is an image of the 3d object if it helps!

    [​IMG]

    If the above doesn't work use this link:

    http://i.imgur.com/KibfO.png

    The following is my work. The first image is my work trying method of washers. The answer I obtained is wrong. The second image is my work trying cylindrical shells. I have not attempted this answer because I only have one attempt left. Please let me know where I am going wrong!

    Method of washers:

    [​IMG]
    http://i.imgur.com/sCONu.jpg

    Cylindrical Shells:

    [​IMG]
    http://i.imgur.com/yKUmH.jpg

    Thank you SO much in advance for your help!

    ***I ended up getting the answer. After re-checking my work (again) I found that I accidentally dropped an x.
     
    Last edited: Jan 20, 2012
  2. jcsd
  3. Apr 14, 2012 #2
    Re: A frustum of a right circular cone with height h, lower base radius R, and top ra

    can you explain your work in the second picture? thanks!
     
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