Written by: Cindra Drowne-Walsh
Now you can easily in AutoCAD 2014
Place an Arc in your drawing, immediately following the Arc command start the Line command. At the command prompt “Line specify first point” ENTER, (*do not select the end of the Arc). The Enter selects the last placed Arc endpoint and places a line Tangent to the Arc. Continue with the Line command as you normally would.
*The Tangent Line attaches to the endpoint of the last (3rd) placed arc point.