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Homework Help: Want to find angle between two vectors

  1. Sep 20, 2008 #1
    1. The problem statement, all variables and given/known data

    Two vectors A ⃗ and B ⃗ are such that A ⃗+B ⃗=C ⃗ and A2+B2=C2 .You need to find the angle θ between the positive directions of A ⃗ and B ⃗.
     
  2. jcsd
  3. Sep 20, 2008 #2

    CompuChip

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    Hint: consider
    [tex](\vec A + \vec B)^2 = (\vec A + \vec B) \cdot (\vec A + \vec B)[/tex]
     
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