I have a polyline drawn, "A" and "B" in the image are dynamic, and it will affect the bulge. I am not sure how to calculate that? I understand bulge is the angle, and I can get this hard coded fairly easy but I need this to be formula driven.

Just not that smart to really figure that out.

How do I capture the angle from these two points?? Like if I go up 10 inches on "A", the angle will change but I am not sure how to capture that.