Add a Perpendicular Constraint
- Select Sketch | Constraints | Add perpendicular constraint.
- Select the first line. This line keeps its position.
- Select the second line. This line moves so that it is perpendicular with the first line.
- Add more perpendicular constraints by repeating steps 2 and 3 or finish adding perpendicular constraints by pressing the ESC key or the middle mouse button.
If you add a line perpendicular to another line by using the T key, a perpendicular constraint is automatically created.