A picture is painted on a square cardboard of side 12cm such that there is a margin of 2 cm along each of its sides. Find the total area of the margin.
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Length of painted cardboard=8 cm and breadth of painted card =5cm
Since, there is a margin of 1.5cm long from each of its side.
Therefore reduced length
=8−(1.5+1.5)=8−3=5cm
And reduced breadth
=5−(1.5+1.5)=5−3=2cm
∴ Area of margin=Area of cardboard(ABCD)−Area of cardboard(EFGH)
=(AB×AD)−(EF×EH)
=(8×5)−(5×2)
=40−10
=30cm
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