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Math Help - Perimeter of the design

  1. #1
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    Perimeter of the design

    drawing and measurement of a rectangle and square are shown in attached file.

    what is the perimeter of the design? Please help.
    Attached Thumbnails Attached Thumbnails Perimeter of the design-perimeter.png  
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  2. #2
    Junior Member RHandford's Avatar
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    Hi

    Well I make it 2(11+6*2+5)+6+6cm

    Can you see where the numbers come from?
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  3. #3
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    Hmmm...I make it 2(11 + 6 + 5 + 12) = 68
    (But I've only had one coffee so far...)
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  4. #4
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    Please can you explain how do u arrive the figure 68 . Why did apply the formula 2(11+6*2+5)+6+6cm
    If you can expalin the mathod it would be very appreciate.
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  5. #5
    Junior Member RHandford's Avatar
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    Quote Originally Posted by alanpaul View Post
    Please can you explain how do u arrive the figure 68 . Why did apply the formula 2(11+6*2+5)+6+6cm
    If you can expalin the mathod it would be very appreciate.
    Perimeter of the design-perimeter.png

    So

    2(11+6*2+5)+6+6 cm = 2(A+B*2+D)+C+C cm (Please see attached edited diagram)

    2(A+B*2+D) - This part deals with the rectangles at the top and bottom. It is multiplied by two as they are the same.
    +C+C cm - This part deals with the square in the middle.

    As the image is equal round the center axis you could change it to:

    2(11+6*2+11) cm which should give you the same answer, but as I have not had my coffee yet I would not guarantee it!
    Last edited by RHandford; September 28th 2010 at 11:39 PM. Reason: Fixed typos
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  6. #6
    Junior Member RHandford's Avatar
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    Hi

    I have just noticed you dont really need to do all the above.
    As the shape in the middle is a square you just need:
    4(11+6) or 4(A+B)
    because the square in the middle gets canceled out.

    Hope this helps
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