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Stupid Question About Finding the Angle of a Vector

  1. Aug 20, 2009 #1
    :smile: Okay then!

    Let's say we are ONLY working in the 1st Quadrant of the x-y plane. I have some vector in that region that makes some angle with the +x axis. I then rotate that vector through some angle.

    The initial points of the vector before and after are coincident, i.e. I only move the terminal end to some new point while maintaining the vectors magnitude.

    I know the initial point, I know the terminal points of both the original and new vector.

    I now need the angle that I must have rotated through to get to the new point.

    Is this a dot product problem?
  2. jcsd
  3. Aug 20, 2009 #2


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    That's what it is.
  4. Aug 20, 2009 #3
    :smile: Alrighty-then!
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