w5 l2
Post on 03-Jul-2015
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Perpendicular lines
• The Compass
3rd method for drawing
perpendicular lines
Start with a line segment AB
Place the compass on one end of the line segment.
Set the compass width to approximately two thirds of the line
length. The actual width does not matter.
Without changing the compass width, draw an arc above and below the line
Again without changing the compass width, place the compass point on the
other end of the line.
Draw an arc above and below the line so that the arcs cross the first two.
Using a ruler, draw a line between the points where the arcs intersect.
This line is perpendicular to the first line and bisects it (cuts it at the exact
midpoint of the line.
Lets practice!
• Draw a line on the paper provided and use your compass!
Lets review and see what you know!
• http://www.mangahigh.com/en/maths_games/shape/understanding_properties_of_shape/recognise_perpendicular_and_parallel_lines
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