Results 1 to 3 of 3

Math Help - Volume of a right circular cone

  1. #1
    Member
    Joined
    Oct 2008
    Posts
    242

    Volume of a right circular cone

    I wouldn't even know where to begin with this problem. Any suggestions?
    Attached Thumbnails Attached Thumbnails Volume of a right circular cone-picture-3.png  
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor Reckoner's Avatar
    Joined
    May 2008
    From
    Baltimore, MD (USA)
    Posts
    1,024
    Thanks
    75
    Awards
    1

    Smile

    Quote Originally Posted by fattydq View Post
    I wouldn't even know where to begin with this problem. Any suggestions?
    The volume of a right circular cone is V=\frac13\pi r^2h\text. It looks like you almost had it, but the given radius is 5r, not 5\pi\text.

    If you want to derive the formula, an easy way to do it is to position a right triangle such that its right angle is at the origin and its two legs along the x- and y-axes, and find the volume of the solid resulting from revolving the triangular region about one of the axes.
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Member
    Joined
    Oct 2008
    Posts
    242
    Thanks, you've been replying in several of my threads, thank you very much. I've been drilling myself for a test this friday and I'm solid on everything but volumes.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 1
    Last Post: February 7th 2011, 02:47 PM
  2. Replies: 8
    Last Post: September 7th 2010, 06:37 AM
  3. Circular Cone
    Posted in the Geometry Forum
    Replies: 2
    Last Post: March 14th 2010, 03:07 PM
  4. right circular cone
    Posted in the Pre-Calculus Forum
    Replies: 2
    Last Post: October 21st 2009, 06:27 PM
  5. Right Circular Cone Volume
    Posted in the Geometry Forum
    Replies: 5
    Last Post: January 24th 2007, 02:04 PM

Search Tags


/mathhelpforum @mathhelpforum