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Homework Help: How do I choose the correct angle when graphing vectors from unit notation?

  1. Sep 15, 2011 #1
    1. The problem statement, all variables and given/known data

    Draw the following vector. Label the angle that specifies the vector's direction, then find its magnitude and direction.

    2. Relevant equations

    vector a = 2.0i - 6.0j

    3. The attempt at a solution

    I get stuck here:


    I don't know which angle to use.
  2. jcsd
  3. Sep 15, 2011 #2
    I used the red one but the back of the book uses the brown one :/
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