Question 22

= 9 + 4 = 32 + 22 On the number line, take OA = 3 units. Draw BA = 2 units, perpendicular to OA. Join OB (see Fig.1.1). By Pythagoras theorem, OB = 13 Using a compass with centre O and radius OB, draw an arc which intersects the number line at the Fig. 1.1 point C. Then, C corresponds to 13 . Remark : We can also take OA = 2 units and AB = 3 units.

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