How do you know if a point lies on a line?

Question

Geometry

Good day, there is a line (segment) with coordinates x1:y1 , x2:y2 , width h , angle a and there is a point x3:y3.
Actually, the question is in the title. There is an assumption that the line must first be converted to a polygon, and then an algorithm should be used to see if the point lies in the polygon.

PS I'm not sure about the correct tags, correct

Answer 1

Here you will find everything you need: www.jeffreythompson.org/collision-detection/line-c...
if anything use a translator