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Math Help - Stuck on problem

  1. #1
    PIR
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    Stuck on problem

    Hi all, i'm a little stuck on this question:



    Does the perimeter = 3h + πr?
    Area of the window =
    h^2 + ( πr^2 / 2)?
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  2. #2
    MHF Contributor
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    Quote Originally Posted by PIR View Post
    Hi all, i'm a little stuck on this question:

    Does the perimeter = 3h + πr?
    Area of the window =
    h^2 + ( πr^2 / 2)?
    No

    The length of the bottom is 2r and not h
    The perimeter is 2r + 2h + πr
    The area is πr²/2 + rh
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  3. #3
    PIR
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    Quote Originally Posted by running-gag View Post
    No

    The length of the bottom is 2r and not h
    The perimeter is 2r + 2h + πr
    The area is πr²/2 + rh
    how do i go about rearranging the equations to find r and h? given that the perimeter has to equal 12meters.
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  4. #4
    Flow Master
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    Quote Originally Posted by PIR View Post
    Hi all, i'm a little stuck on this question:



    Does the perimeter = 3h + πr?
    Area of the window = h^2 + ( πr^2 / 2)?
    Search the forums for threads about norman window eg. http://www.mathhelpforum.com/math-he...w-problem.html

    and you will probably find your question answered.
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  5. #5
    PIR
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    its called a norman window!!!

    Thank you!
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  6. #6
    PIR
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    Could someone tell me if i simplified this correctly?

    A =1/2πr^2+2r((12-2r-πr)/2)

    I got:
    A=12r-(2+π/2) r^2
    Last edited by PIR; March 14th 2009 at 03:30 PM.
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