Question

Draw line l. Take point P anywhere outside the line. Using a set square, draw a line PQ perpendicular to line l.

Answer 1

Steps of construction:

1. Draw line l. Take point Q anywhere outside l.
2. Place one of the arms of the right angle of a set square along the line l.
3. Slide the set square along the line in such a way that the other arm of its right angle touches point P.