.

1. Perpendicular lines

2. 3rd method for drawing
perpendicular lines
• The Compass

3. Start with a line segment AB

4. Place the compass on one end of the
line segment.

5. Set the compass width to
approximately two thirds of the line
length. The actual width does not
matter.

6. Without changing the compass width,
draw an arc above and below the line

7. Again without changing the compass
width, place the compass point on the
other end of the line.

8. Draw an arc above and below the line
so that the arcs cross the first two.

9. Using a ruler, draw a line between the
points where the arcs intersect.

10. This line is perpendicular to the first
line and bisects it (cuts it at the exact
midpoint of the line.

11. Lets practice!
• Draw a line on the paper provided and use
your compass!

12. Lets review and see what you know!
• http://www.mangahigh.com/en/maths_game
s/shape/understanding_properties_of_shape/
recognise_perpendicular_and_parallel_lines