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# How to draw parallel and perpendicular lines

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### How to draw parallel and perpendicular lines

1. 1. This presentation has been made for you byFRANCISCO GUIJARRO BELDA From Isaac Albéniz Secondary School Leganés. Madrid. Spain.
2. 2. PARALLEL LINES1) Imagine you have a line, labeled m in the picture, and you want to draw a lineparallel to it passing through the point A. Take the set square with your hands. Theright is always for the small one and the left for the big.
3. 3. PARALLEL LINES2) Align the set square with line m as you see in the picture.
4. 4. PARALLEL LINES3) Following the arrow, move the set square in order to keep both rulers together.Hold the big set square steadily because you are about to start.
5. 5. PARALLEL LINES4) gently slide the small set square along the long side of the big one (watch thearrow on the picture).
6. 6. PARALLEL LINES5) Sometimes, we might also need to slide the big set square because the point istoo far away. This is not a problem, just hold the small one and move the big setsquare the distance you need as illustrated in the picture below. Again, watch thearrow.
7. 7. PARALLEL LINES6) Again, hold the big set square and slide the small one until the point. We areabout to finish.
8. 8. PARALLEL LINES7) Holding both set squares steadily with your left hand, draw the line.
9. 9. PARALLEL LINES8) This will be your final result.
10. 10. PERPENDICULAR LINES1) Do steps 1 to 3 the same manner you did for parallel lines. Then, hold the big setsquare with your left hand and rotate the small one 90 degrees as you can see onthe screen. 90º
11. 11. PERPENDICULAR LINES2) Put this time the small set square so that it can lean on the longest side of thebig one.
12. 12. PERPENDICULAR LINES3) Move the small ruler just to make it go until point A (on the picture, following theblack arrow).
13. 13. PERPENDICULAR LINES4) Draw the line and you are done.