Use Polar Tracking and PolarSnap

Restrict Cursor Movement

Combine or Offset Points and Coordinates

 

Create and Modify Objects > Use Precision Tools > Restrict Cursor Movement > 

Lock an Angle for One Point (Angle)

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Concept

Quick Reference

You can specify an angle override that locks the cursor for the next point entered.

To specify an angle override, enter a left angle bracket (<) followed by an angle whenever a command asks you to specify a point. The command prompt sequence below shows a 30-degree override entered during a LINE command.

Command: line

Specify first point: Specify a start point for the line

Specify next point or [Undo]: <30

Angle Override: 30

Specify next point or [Undo]: Specify a point

The angle you specify will lock the cursor, overriding Grid Snap, Ortho mode, and PolarSnap. Coordinate entry and object snaps have precedence over an angle override.