Hy, I need to calculate angle from 2x2 rotation matrix. How exactly i can do that?
Thank you, for help.
You mean this kind of rotation matrix?
Rotation matrix - Wikipedia, the free encyclopedia
You can derive the rotation matrix by considering what (1,0) and (0,1) map to when rotated by angle theta.
If you have a matrix of that form and need to find theta, you can do so using inverse trig functions.