Parallel and perpendicular lines

How do we use the set squares?

You have to handle your set square softly and with accuracy without too much pressure on them, only the needed one to avoid movement.

PARALLEL LINES

1. The 45 set square hypotenuse (longest side) is placed attached to the line to which we want to draw the parallels (GUIDE).
2. The 60-30 set square hypotenuse is attached to the 45 set square leg.
3. Fix the 60-30 set square and move the 45 set square upwards or downwards drawing the desired parallel lines along its hypotenuse.

PERPENDICULAR LINES

If we want to draw perpendicular lines to one direction, we will have to follow the first two steps as stated for parallel lines and then the following ones:

1. Having fixed the 60-30 set square, the 45 set square is turned until the other leg is attached to the hypotenuse of the 60-30 set square.
2. Draw the perpendicular line along the hypotenuse of the 45 set square.

Let's review how to draw parallel and perpendicular lines using the triangular set squares.

Eva A., 1st A (former student) recorded, some years ago, a video at home for us. It is GREAT!!!!

Thank you very much Eva.

For left-handed students:

More angles... 

Technical Drawing: Sketch-Draft-Drawing

• Sketch is a rapidly executed freehand drawing often consisting of a multitude of overlapping lines that is not intended as a finished work. 
• Draft is an early version of a drawing with dimmensions. 
• Plans are the final version of drawings of objects with all the information needed to be built or constructed.

• Bocetos
• Croquis
• Planos

Pencil scale

You will need:

1. 2H or 3H pencil - for technical drawing, lines with ruler
2. HB pencil - for writing and handmade drawings: sketches and draft