7. A painting 40 cm long and 28 cm wide is painted on a
margin of 2 cm along each of its sides. Find the total area of the margin.
8. Each side of a square flower bed is 3 m 80 cm long. It is extended by digging a strip
50 cm wide all around it. Find the area of the enlarged flower bed and also the increase
in the area of the flower bed.
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answer:7)256sq cm
Step-by-step explanation:
area of painting including margin:
=40×28
=1120sq cm
length of the painting without margin:
=40-(2+2)
=40-4
=36 cm
width of the painting without margin:
=28-(2+2)
=28-4
=24 cm
area of the painting without margin:
=36×24
=864sq cm
area of the margin=area of the painting without margin- area of painting with margin
=1120sq cm- 864sq cm
=256sq cm
Hence 256sq cm in the total area of the margin..
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