Question

Show how root of 5 can be represented on numbers line

Answer 1

Draw a line with 1 cm markings -2, -1, 0, 1, 2 , 3,
on 2 cms draw a perpendicular 
Cut an arc of 1 cm on the perpendicular
Draw a line from 0 to the arc
With your compass and cut the line you drew first.

hope it helps.