Objects creation and modification	Using Precision Tools
Using Smart Polar Snap
Overview     Operations     Commands

Hot to use Smart Polar Snap 

Enable Smart polar snap and begin to draw an object, PLINE for example, or use the Grips to modify the geometry of an existing object.
You will see the tracking line of Smart polar snap, showing some appropriate directions

  Status bar :

  Menu : Tools  Snaps  Smart Polar Snap

 Command: SMART_POLAR