- Choose the desired 
line type in the options
toolbar.
- 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:
  
- 
You can set the length or angle of the line to fixed values using the appropriate inputs in the options toolbar.