Its sides are 6.0 cm and 7.2 cm.

Steps of construction :

1. Let adjacent side AB = 6.0 cm and BC = 7.2 cm.

2. Draw a line segment BC = 7.2 cm.

3. Draw BX ⊥ BC and CY ⊥ BC.

4. With B as center and radius equal to 6 cm draw arc cutting BX at A.

5. With C as center and radius equal to 6 cm draw arc cutting CY at D.

6. Join AD.

Hence, ABCD is the required rectangle.