7. A painting 40 cm long and 28 cm wide is painted on a cardboard such

1.	7. A painting 40 cm long and 28 cm wide is painted on a cardboard such that there ismargin of 2 cm along each of its sides. Find the total area of the margin.
Answer» Solution :- Total length of the painting including the margin = 40 cm Total width of the painting including the margin = 28 cm Area of the painting including the margin = 4028 Area of the painting including the margin = 1120 sq cm Length of the painting without the margin = 40 - (2 + 2) = 40 - 4 = 36 cm Width of the painting without the margin = 28 - (2 + 2) = 28 - 4 = 24 cm Area of the painting without the margin = 3624 Area of the painting without the margin = 864 sq cm Area of the margin = Area of the painting including the margin - Area of the painting without the margin ⇒ 1120 - 864 = 256 sq cm So, the total area of the margin is 256 sq cm Thanks

7. A painting 40 cm long and 28 cm wide is painted on a cardboard such that there ismargin of 2 cm along each of its sides. Find the total area of the margin.

Answer»

Solution :-

Total length of the painting including the margin = 40 cm

Total width of the painting including the margin = 28 cm

Area of the painting including the margin = 40*28

Area of the painting including the margin = 1120 sq cm

Length of the painting without the margin = 40 - (2 + 2)

= 40 - 4

= 36 cm

Width of the painting without the margin = 28 - (2 + 2)

= 28 - 4

= 24 cm

Area of the painting without the margin = 36*24

Area of the painting without the margin = 864 sq cm

Area of the margin = Area of the painting including the margin - Area of the painting without the margin

⇒ 1120 - 864

= 256 sq cm

So, the total area of the margin is 256 sq cm

Thanks