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Vectors question - given points

  1. Jan 26, 2009 #1
    Vectors question -- given points

    Lads, You're going to laugh at me, but I started my new unit today, and I forgot my dang textbook at school, I'm doing as much research online as I can, but I'm having a rough time figuring this guy out. Any insight would be very helpful! Thanks!

    1. The problem statement, all variables and given/known data

    Given the points A(-3,1), B(4,7), C(9,2), and D(2,-4) prove algebraically that they form a parallelogram.
  2. jcsd
  3. Jan 26, 2009 #2


    Staff: Mentor

    Re: Vectors question -- given points

    If these points form a parallelogram, opposite sides must be parallel and equal in length. Form vectors of AB, DC, AD, and BC. The first two vectors I've listed should be equal (and therefore parallel). So should the last two.
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