The perpendicular constraint causes selected lines, curves, or ellipse axes to lie at 90 degrees to one another.
- On the ribbon, click Sketch tab Constrain panel Perpendicular Constraint .
- Click the first line, curve, or ellipse axis.
- Click the second line, curve, or ellipse axis.
- Continue to place perpendicular constraints, or do one of the following to quit:
- Right-click, and select Done.
- Press Esc.
- Select another command.