Question

a painting 40cm long and 28cm wide is painted on a cardboard such that their margin of2cm along each of its sides . find the total area of the margin

Answer 1

area of cardboard = 2(l+b)
2(40+28)
2(68)
136sq.cm.
area of margin 2(l+b)
2(24+30)
144sq.cm.
total area of margin=144-136=8cm^2