2 points
with more detail (tips for drawing a specific length of a line; type the BOLD one into command-line).
specify the First point (left-click).
@50<0 for straight line.
@50,50 for Square or @50,30 for Rectangle.
@60<120 for 60mm line at 120 degrees. (try {-} (minus) symbol before 'degree' and see what happen!!)