Question

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.​

Answer 1

Answer:

Total area of the margin is 30 $cm^2$

Step-by-step explanation:

The cardboard is 8 cm long and 5 cm wide .

∴ Area of the cardboard is A = 8 × 5 = 40 $cm^2$

Now there is a margin of 1.5 cm along each of it's sides.  

   ∴ The effective area is B = ( 8 - (2×1.5)) × ( 5 - (2×1.5)) $cm^2$

                                             = 5 × 2 = 10 $cm^2$

  ∴ Total area of the margin = A - B $cm^2$

                                               = 40 - 10 = 30 $cm^2$