Tangent (Point, Circle)
Toolbar / Icon:
 
   
 
   
Menu: Draw > Line > Tangent (Point, Circle)
Shortcut: L, T, 1
Commands: linetangent | tangent | lt1
Description:
Create tangents from a coordinate to an existing arc, circle or ellipse
entity with this tool.
Procedure:
  - Use the mouse to specify the location of the start point of the line or
  enter a coordinate in the command line.
- Click the entity to which you want to create the tangent. Usually, two
  tangents are possible. When moving the mouse around, you can see a preview of
  the tangent that will be created.