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Math Help - Help me with vectors

  1. #1
    Member helloying's Avatar
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    Help me with vectors

    Kindly explain to me how to do part (a).tell me about the concepts behind it also, because i am not very sure about the it.thanks.
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  2. #2
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    Quote Originally Posted by helloying View Post
    Kindly explain to me how to do part (a).tell me about the concepts behind it also, because i am not very sure about the it.thanks.
    vector AB= (pv of B)-(pv of A)=(3i+j)-(-i-j)=4i+2j
    similarly find othr vectors
    BC=-2i+j
    CD=-2i-j
    DA=0i-2j
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  3. #3
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    vector AB= (pv of B)-(pv of A)=(3i+j)-(-i-j)=4i+2j
    similarly find othr vectors
    BC=-2i+j
    CD=-2i-j
    DA=0i-2j


    we can see that AB =-2 times CD
    so arms AB and DC are parallel

    length of AB=|AB|=sqrt[20]
    length of CD=|CD|=sqrt[5]
    Last edited by sumit2009; March 6th 2009 at 05:10 AM. Reason: type error
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