Question
Find a point corresponding to 
on the number line.
Solution
Draw a number line l. On the number line OA = 3 units, OB = 4 units so that AB = 1 unit. At B, draw BC = 1 unit, perpendicular to l and join AC. By Pythagoras theorem, 
Using a compass with centre A and radius AC, draw an arc which intersects
the number line at the point D. Then, point D represents
.
Using a compass with centre A and radius AC, draw an arc which intersectsthe number line at the point D. Then, point D represents
.
