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Math Help - Two vector questions

  1. #1
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    vector question

    Based on this diagram http://i55.tinypic.com/2w4wtio.jpg , what is the sum of: ->AB + ->ED + ->CA. Since they have to go head to tail and ED=BC would it be AB + BC + CA? This does not look right to me.

    I hope I posted this in the correct forum and I apologize if I did not. Thanks.
    Last edited by Jemde; August 15th 2011 at 07:35 PM.
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  2. #2
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    Re: Two vector questions

    The way you posted this makes very difficult to read.
    If we know that BCDE is a parallelogram then \overrightarrow {AB}  + \overrightarrow {ED}  + \overrightarrow {CA}  = 0
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  3. #3
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    Re: Two vector questions

    The base is a square.
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  4. #4
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    Re: Two vector questions

    Quote Originally Posted by Jemde View Post
    The base is a square.
    Good grief: A square is surely a parallelogram.
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  5. #5
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    Re: Two vector questions

    The base isn't really important. It looks to me like AB+ ED gives us AC. Adding CA takes us back to A. AB+ED+ CA is the 0 vector.
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  6. #6
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    Re: Two vector questions

    Quote Originally Posted by Plato View Post
    Good grief: A square is surely a parallelogram.
    I know I just thought I should mention it in case it was important. I've just started learning about vectors and I was not sure if you needed to know. Sorry if I caused any confusion. Thanks HallsofIvy and Plato I can see why it equals zero now.
    Last edited by Jemde; August 15th 2011 at 07:35 PM.
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