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Math Help - Lines in a plane 2

  1. #1
    Senior Member
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    Nov 2008
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    [solved]Lines in a plane 2

    Find the distance between l1 and l2:

    l1: r=(6,-4,0)+t(0,-1,1); l2: r=(0,5,3)+s(-2,0,1)

    Can someone just check or verify if my answer is correct?

    PQ=(-6,9,3)
    n=(-1,-2,-2)
    |n|=3

    D=(-6,9,3) . (-1,-2,-2)
    ----------------------
    3
    final answer
    Distance is 6 units.

    Let me know and thanks for your help because there are no answers to these q's in the back.
    Last edited by skeske1234; August 30th 2009 at 12:07 PM.
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  2. #2
    MHF Contributor
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    Hi

    I agree with your work but do not forget the absolute value at the numerator

    D = \frac{|PQ.n|}{||n||}
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