- Click to define arc's center. Optionally, click and drag first point to set drawing plane.
- Move cursor to define first arc point or enter radius.
- Click to set first arc point.
- Move cursor around the protractor guide or enter angle.
- Click to set second arc point.
- Esc = Cancel operation.
- Tip: Click Window > Model Info > Units > Angle Units to change snapping angle.
- Ctrl '+' or Ctrl '-' = Change the number of segments
- Shift (before 1st click) = Lock arc to current orientation
- Shift (after 1st click) = Lock tool to current inference direction
- Arrow keys (before 1st click) = Lock Protractor Rotation Axis direction (Up=Blue, Left=Green, Right=Red, Down=Parallel)
- Arrow keys (after 1st click) = Lock drawing direction to specific inference direction (Up=Blue, Left=Green, Right=Red, Down=Parallel/Perpendicular)