Creo Direct > Designing in the Creo Direct Environment > Working in Part Mode > Working with 2D Geometry > Creating 2D Geometry > Lines > About the Line/Arc Chain Tool
  
About the Line/Arc Chain Tool
The line tool creates a chain of lines or arcs. You can use this tool to create connected vertical, horizontal, or other line types. Use the S key to toggle between the Line Creation and Arc Creation modes. You can toggle to the Line Creation mode even as an arc is rubberbanding. After the arc is created, the Line Creation mode is activated again.
Use the line tool to create the following types of line or arc:
Line Tool
Description
Line/Arc Chain
Creates connected lines and arcs.
Tangent
Creates a line tangent from an arc or a circle. Make sure that you have an arc, circle, or a spline as a part of your sketch.