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Math Help - Paralellogram Unnsovlable Zeroes!

  1. #1
    Junior Member JoeyCC's Avatar
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    Paralellogram Unnsovlable Zeroes!

    Here is the question in hand:



    The problem is, I try using the cross product and I get zero.

    Let the first point be A, second be B, third be C and fourth be D;

    ad - bc = 0

    So how do I solve this?

    0 is not an accepted answer.
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  2. #2
    MHF Contributor
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    Quote Originally Posted by JoeyCC View Post
    Here is the question in hand:



    The problem is, I try using the cross product and I get zero.

    Let the first point be A, second be B, third be C and fourth be D;

    ad - bc = 0

    So how do I solve this?

    0 is not an accepted answer.
    Let u = \vec{CD} and v = \vec{AC} with the third compenent of each to be zero, then cross them and take the magnitude.
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  3. #3
    Junior Member JoeyCC's Avatar
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    The cross product has three different zero componenets. It does not work.
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  4. #4
    MHF Contributor
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    Quote Originally Posted by JoeyCC View Post
    The cross product has three different zero componenets. It does not work.
    Show us what you did.
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