Results 1 to 5 of 5

Thread: function of cylinder

  1. #1
    Junior Member eah1010's Avatar
    Joined
    Nov 2005
    Posts
    28

    Thumbs down function of cylinder

    the surface of a tin can, can be found by using formula A=2pie(r)^2 + 2 pie(r)h. A = Area R = Radius H = Height. Write h as a functoin of A and R

    im real sorry guys im just not understanding this...
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor Quick's Avatar
    Joined
    May 2006
    From
    New England
    Posts
    1,024
    Quote Originally Posted by eah1010 View Post
    the surface of a tin can, can be found by using formula A=2pie(r)^2 + 2 pie(r)h. A = Area R = Radius H = Height. Write h as a functoin of A and R

    im real sorry guys im just not understanding this...
    it's pi, not pie...

    Anyway, your job is to solve for h.

    We have: $\displaystyle A=2\pi r^2+2\pi rh$

    Then: $\displaystyle A-2\pi r^2=2\pi rh$

    Divide: $\displaystyle \frac{A-2\pi r^2}{2\pi r}=h$

    And that's the answer!
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Senior Member
    Joined
    Apr 2006
    Posts
    401
    Quote Originally Posted by Quick View Post
    it's pi, not pie...

    Anyway, your job is to solve for h.

    We have: $\displaystyle A=2\pi r^2+2\pi rh$

    Then: $\displaystyle A-2\pi r^2=2\pi rh$

    Divide: $\displaystyle \frac{A-2\pi r^2}{2\pi r}=h$

    And that's the answer!
    Which can be simplified to:

    h = [A/(2*Pi*r)] - r
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Senior Member OReilly's Avatar
    Joined
    Mar 2006
    Posts
    340
    Quote Originally Posted by Quick View Post
    it's pi, not pie...
    I always laugh when I see that "pie"...

    $\displaystyle \pi $ is pronunced as "pee" not "pie".
    My guess is that users with native English speech pronunce $\displaystyle \pi $ as "pie" because they spell "i" like in alphabet.
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Forum Admin topsquark's Avatar
    Joined
    Jan 2006
    From
    Wellsville, NY
    Posts
    11,122
    Thanks
    719
    Awards
    1
    Quote Originally Posted by OReilly View Post
    I always laugh when I see that "pie"...

    $\displaystyle \pi $ is pronunced as "pee" not "pie".
    My guess is that users with native English speech pronunce $\displaystyle \pi $ as "pie" because they spell "i" like in alphabet.
    Really? I didn't know that. I once had a 10 minute discussion with a guy on the correct way to pronounce $\displaystyle \xi$. He wasn't Greek himself, but had studied it a bit. (I had a Korean Physics professor who simply called it "squiggly." ) Of course, if I started talking to someone about "pee" they'd never understand I was talking about "pi."

    -Dan
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Cubic Function of a Cylinder
    Posted in the Pre-Calculus Forum
    Replies: 3
    Last Post: Oct 4th 2009, 10:24 AM
  2. cylinder PDE
    Posted in the Differential Equations Forum
    Replies: 0
    Last Post: Apr 13th 2009, 07:20 AM
  3. cylinder
    Posted in the Calculus Forum
    Replies: 0
    Last Post: Nov 9th 2008, 02:24 PM
  4. cylinder
    Posted in the Geometry Forum
    Replies: 1
    Last Post: Jun 15th 2008, 11:10 AM
  5. Function of a cylinder
    Posted in the Calculus Forum
    Replies: 5
    Last Post: Aug 3rd 2006, 04:10 AM

Search Tags


/mathhelpforum @mathhelpforum