Is it possible to find the angle between a line and the x-axis?

Question

JavaScript

Greetings.
Interested in how you can find the angle between the segment and the X axis, if the coordinates of the segment are known.
Perhaps atan2 function in js?
If not, what is it for?
I read on MDN, I didn’t really understand what was happening.

Answer 1

Strange you read, there is even a picture attached.

Math.atan2(vector.y, vector.x) = угол между вектором и осью X