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Math Help - finding angle made by vector

  1. #1
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    finding angle made by vector

    question:Vector A lies in the xy plane, has a magnitude of 18 units and points in a direction 250 from the +x direction. Vector B has a magnitude of 12 units and points in the +z direction. What is the vector product of C=AxB

    answer:C=216 units and points 160 from positive x axis

    confusion: I'm stuck with the angle part, why wouldn't it still be 250 in x direction and coming out of the page? I also considered arccos(12/18) but that's no good.
    Last edited by superdude; February 7th 2010 at 04:46 PM. Reason: corrected spelling
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  2. #2
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    The cross product gives you a new vector which is ortogonal to booth initial vectors: C=AxB => C is ortogonal to A and to B. Oh, I missunderstood the question
    Last edited by felper; February 7th 2010 at 06:25 PM.
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  3. #3
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    ok so the answer come from 180-20=60
    I guess the question doesn't ask for the answer given
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