Q.3 A picture is painted on a cardboard 8 cm long and 5 cm wide such that there is a margin of 1. 5 cm along each of its sides. Find the total area of the margin.
Area of the cardboard = l × b $$= 8 cm × 5 cm = 40 cm^2$$
= 5 cm × 2 cm = 10 $$cm^2$$
Area of the margin$$= 40 cm^2 – 10 cm^2 = 30 cm^2$$ Hence, the required area = 30$$cm^2$$