- Specify the start point of the first line segment. You can use the mouse
  or enter a coordinate in the console.
- Specify the endpoint of the first line segment.
- Specify the endpoints of additional line segments. Click the 'Close'
  button in the options tool bar to close the sequence: 
  
   
 If you need to undo a single line segment, you can do so by clicking
  the 'Undo' button:
  
- If you want to restrict the angle or length of line segments, you can do so by
  clicking the 'Restrict Angle or Length' button, and entering a length and / or 
  angle.
  
 