Slide 3:
Lines that are at right angles to each other are said to be perpendicular lines.
Slide 4:
In the diagram below, line AB is at right angles to line XY. The right angle is indicated by a small square. We say that AB is perpendicular to XY X Y A B
Slide 5:
Drawing a perpendicular line at a point on a given line
Slide 6:
X Y B Set an edge of the set square on the given line so that the other edge is just in contact with the point Draw a line that passes through the given point with the help of the set square
Slide 7:
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