Finding the angle between lines that Ive plotted

Good evening ,

I've been trying to find the angle of the lines in the attached photo and i can't seem to find it correctly.

This is the code i've been using.

Please help.

% plot the mouse point coordinates on the figure
L = plot(mousePointCoords(:,1), mousePointCoords(:,2),'b','LineWidth',2);

u = mousePointCoords(:,1) 
v = mousePointCoords(:,2) 

CosTheta = dot(u,v)/(norm(u)*norm(v));
ThetaInDegrees = acosd(CosTheta);

Answer 1

[KSSV]

YOu have multiple ways to do this. Refer below:

https://in.mathworks.com/matlabcentral/answers/78195-how-to-measure-angle-between-the-lines

[Zo]

okay so i did use them. However when i ran the code, i got three angles and im not sure which is the angle that i am looking for. I attached what i got.