Use Polar Tracking and PolarSnap
 
 
 

To draw objects using polar distance

  1. Turn on snap and polar tracking.

    Make sure Polar Snap is selected in the Drafting Settings dialog box, Snap & Grid tab.

  2. Start a drawing command, such as LINE.
  3. As you move your cursor, notice that the dotted polar tracking line displays a tooltip that shows distance and angle.
  4. Specify a point.

    The length of the new line conforms to the polar distance.

 Command entry: DSETTINGS