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Math Help - Vectors

  1. #1
    Junior Member
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    61

    Vectors

    Write a vector equation connecting a, b, c and d to express the fact that vectors AB = DC.
    Deduce from your equation that
    a) DA=CB,
    b) if E is a point such that OAEC is a parallelogram, then OBED is a parallelogram.

    For a) AB=b-a DC=c-d, so b-a=c-d. This can be rearranged to show that a-d=b-c , which shows that DA=CB

    But for b) what should be done?? How can I deduce from the equation?? I tried finding an expression that included O,A,B,C,D and E so I could rearrange to show that EB and OD were equal and ED and OB equal but without success.
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  2. #2
    Junior Member
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    May 2008
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    I now understand. No need to reply.

    Thanks.
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