Find the angle between two line segments - VB6 and VB.NET

This website gives you the code to get the angle between two line
segments. The code is in VB6, but to convert it to VB.NET all you
have to do is change "Abs" to System.Math.Abs and "atn" to
System.Math.ATAN

http://www.vb-helper.com/howto_find_angles.html