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Math Help - vector question

  1. #1
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    vector question

    ABCD is a straight line



    O is a point so that OA = a and OB = b

    B is the midpoint of AC
    C is the midpoint of AD

    Express in terms of a and b the vectors:

    (i) AC
    (ii) OD
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by Danielisew View Post
    ABCD is a straight line



    O is a point so that OA = a and OB = b

    B is the midpoint of AC
    C is the midpoint of AD

    Express in terms of a and b the vectors:

    (i) AC
    (ii) OD

    (i) So \vec{AC}=2\vec{AB} and \vec{AB}=-\bold{a}+\bold{b}

    (ii) \vec{OD}=\bold{a}+2 \vec{AC}


    and from these you should be able to complete the answers yourself.

    RonL
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