Here we write by 5 = (2)² + 1.

First draw a number line. Construct a right angled ΔOAB on the number line by taking OA = 2 units and AB = 1 unit.

In ΔAOB,

OB = √OA²+ AB² [From Pythagoras Theorem]

= √(2)²+ (1)² = √5

Taking O as the centre and OB as the radius mark an arc with the help of compass which intersects the number line at point C.

OC = OB = √5

Hence, point C is represented on the number line.