> Can someone tell me what series of instructions are necessary to determine > the size of an angle in degrees or brads or radians or grads given the > points which determine a line. For instance if I have a line with > endpoints X1,Y1 and X2,Y2 how do I determine the angle this line makes with > either the X or Y axis. Certainly I can determine the slope of the line > and even the trig functions such as SIN, COS, TAN etc, but how do I > determine the size of the angle in degrees or brads or radians or grads. If you have FB3, look at the Clock code I wrote - does everything you want. If you're still on FB2, let me know and I'll send a copy. Phil.