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4. Hold the ruler fixed, then slide the set 5. Join PQ along the edge through P,
square along the ruler so that the vertical meeting l at Q.
side passes through the given point P.
1 2 3 4 5 6 7 8 9 10 11 12 13
1
1 2 3 4 5 6 7 8 9 10 11 12 13 2
1 3
2 4
3 5
4 6
5 7
6 P 8
P 7 9
8
10
9
13 12 11 10 l A Q 13 12 11 cm 15 B l
A cm 15 B 14
14 13
13 12 5
12 5 11
11 10
10 9
9 8
8 7 3
7 3 6
6 5
5 4 2
2
4
3
3
2 1
2 1 1
1
inches inches

Now PQ ⊥ AB .
P
l
A Q B
activity
Drawing a perpendicular bisector of a line using a transparent tape, a pair of scissors, and a pencil.
Steps of construction:
1. Draw a line segment AB A B
2. Place a strip of transparent tape diagonally across AB as shown in the figure.

A B

3. Repeat step 2 by placing another tape over A 4. Join M and N. MN is the perpendicular bisector of
and B just diagonally across the previous one. . Verify it using a ruler and a protractor.
Both the strips cross at M and N. AB
M
M

A B A B
N N

Maths Talk

Why MN is a perpendicular bisector of AB ? Can you deduce it without measuring?

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