Steps of construction :
1.Construct a △ABC such that AB = 4 cm, AC = 6 cm, BC = 6 cm.
2. Draw the bisectors of ∠A and ∠B and let them meet at O.
3. With O as centre draw OM the right bisector of AB meeting AB at D.
4. With O as centre and OD as radius draw a circle. The circle touches the sides of the △ABC at D, E and F.
Then this is the required in-circle of △ABC.