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You can start by making sure that the next time, you do not add 100 question marks just to make your point clear. As to the solution of your problem, using the search function would have given you the following result:

  1. http://www.pdnotebook.com/2012/07/measuring-angles-in-opencv/
  2. http://feelmare.blogspot.be/2012/10/inner-productthe-angle-between-two.html

However this isn't really a OpenCV problem, rather a mathematical problem.