title: Angle extraction from an oblique triangle with known endpoint (pixel) coordinates in Matlab
body: <p>I need to calculate angle (A) in an oblique triangle in a large set of images in Matlab (R2012a). I know all of the 3 endpoint(pixel) coordinates of every triangle. Can I find out the angles of the triangle by using the endpoint coordinates only (independently of the image) or will I need to find out the length of all the sides and then apply the law of cosines for every triangle ? <a href="http://en.wikipedia.org/wiki/Law_of_cosines" rel="nofollow">http://en.wikipedia.org/wiki/Law_of_cosines</a>
  Thank u for your help, I am new to Matlab and trigonometry!</p>