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.

Answers (1)

It is given that cardboard is 8\; cm long and 5\; cm wide such that there is a margin of 1.5\; cm along each of its sides

It is clear that it is rectangular shaped with length = 8 \ cm \ and \ breadth = 5 \ cm

We know that the area of the rectangle is = length \times breadth

\Rightarrow length \times breadth = 8 \times 5 = 40 \ cm^2                   -(i)

Now, the length and breadth of cardboard without margin is


Area of cardboard without margin is 

\Rightarrow length \times breadth = 5 \times 2 = 10 \ cm^2                              -(ii)

Area of margin is (i) - (ii)

\Rightarrow 40-10= 30 \ cm^2

Therefore, the area of margin is  30 \ cm^2

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