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Homework Help: Paralellogram diagonals

  1. Sep 12, 2010 #1
    1. The problem statement, all variables and given/known data
    Find the length of the two diagonals of a paralellogram with the sides (-2,-2) and (-10,-2)

    2. Relevant equations

    3. The attempt at a solution
    What I have tried is, I drew out the 2 vectors, and then drew out their components and used trig to find the angles where the connect. I also found the magnitude of both the vectors.
    Am i on the right track?
  2. jcsd
  3. Sep 12, 2010 #2


    Staff: Mentor

    Not really. If u = <-2, -2> and v = <-2, -10> are your two vectors, a vector that represents the main diagonal of the parallelogram is u + v. The other diagonal is given by u - v.
  4. Sep 12, 2010 #3
    OMG I totally missed that oh man I fail! Thanks so much, I over complicated it!!!!
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