Angle with three points

Hello, I have a object rotation (video) I have a three points and I would like to know the angle of that points. But two points is always in one place and the third point is moving until get 360°. So I would like to code read the angle from 0 to 360 in one direction.

Answer 1

[Image Analyst]

See this answer: https://www.mathworks.com/matlabcentral/answers/331017-calculating-angle-between-three-points#answer_259649