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.
It is given in the question that,
Length of cardboard = 8 cm
Breadth of cardboard = 5 cm
We know that,
Area of rectangle = Length × Breadth
∴ Area of cardboard including margin = 8 × 5
= 40 cm2
From the figure, it can be observed that the new length and breadth of the given cardboard (When margin is not included) is 5 cm and 2 cm respectively
∴ Area of cardboard not including margin = 5 × 2
= 10 cm2
Area of the margin = Area of the cardboard including the margin – Area of cardboard not including margin
= 40 – 10
= 30 cm2
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