Question

A picture is painted on a cardboard 7 cm long and 6 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

l=7cm}large rect.

b=6cm}" " "

length of smaller rect= length of large rect-2×1.5

7-3=4cm

breadth of smaller rect= breadth of large rect-2×1.5

6-3=3cm

large rect. ■■■■■ small rect.

area=l×b area=l×b

7×6=42cm^2 4×3=12cm^2

area of margin = area of large rect-area of small rect.

42-12

●●●●●30cm^2●●●●●

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