A painting 8cm long and 5cm wide is painted on a cardboard such that there is a margin of 1.5cm along each of its sides.Find the total area of the margin?
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Answer:
area of margin
=area of outer rectangle-area of inner rectangle
L×B - l×b
8×5. - (8-(2w)) ×(5-2w)
40 - 5× 2
40-10
30
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