1. Choose the desired
   [line type](/en/manual/scripts/Draw/Line/doc/Line#type) in the options
   toolbar.
2. Click the line entity to which the new line should be orthogonal.
3. Click the arc, circle or ellipse entity to which the line should be a
   tangent. There are two possible solutions. When moving the mouse around, you
   can see a preview of the tangent that will be created.
