Question

5. A painting 11 cm long and 6 cm wide is painted on a cardboard such that there is a margin of
2.5 cm along each of its sides. Find the total area of the margin.​

Answer 1

Answer:

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

=$30cm 2$

Thus, the total area of margin is $30cm^2$