Connecting two lines at a specific angle

Hello,  I'm sorry if this is a basic question, or has already been answered elsewhere.  I'm trying to draw one line at an exact 45-degree angle from a previous straight line.  The control-click only puts a line at global angles, not at angles relative to the previous segment.  (I'm using X3).

The other feature I'd like to see is the degree displayed of a new segment relative to the last segment as I add segments to a line.  Not sure if that's an option somewhere to display.  If it is, please help me turn it on.