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Math Help - function of cylinder

  1. #1
    Junior Member eah1010's Avatar
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    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...
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  2. #2
    MHF Contributor Quick's Avatar
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    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: A=2\pi r^2+2\pi rh

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

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

    And that's the answer!
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  3. #3
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    Quote Originally Posted by Quick View Post
    it's pi, not pie...

    Anyway, your job is to solve for h.

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

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

    Divide: \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
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  4. #4
    Senior Member OReilly's Avatar
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    Quote Originally Posted by Quick View Post
    it's pi, not pie...
    I always laugh when I see that "pie"...

    \pi is pronunced as "pee" not "pie".
    My guess is that users with native English speech pronunce \pi as "pie" because they spell "i" like in alphabet.
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  5. #5
    Forum Admin topsquark's Avatar
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    Quote Originally Posted by OReilly View Post
    I always laugh when I see that "pie"...

    \pi is pronunced as "pee" not "pie".
    My guess is that users with native English speech pronunce \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 \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
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