Question

7. A painting 40 cm long and 28 cm wide is painted on a cardboard such that there is
margin of 2 cm along each of its sides. Find the total area of the margin.
8. Each side of a square flower her is 3 m​

Answer 1

Step-by-step explanation:

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

Hope it helps

Answer 2

Answer:

given,

length of the wall   = 40 cm

breadth of the wall = 28 cm

area of the wall       = 40 * 28

                                = 1120 cmsqu.

the width of the margin= 2 cm

so the area of first two margin= 160 cmsqu.

area of the other two margin = 112 cmsqu.

      so total are of the margin=160+120

                                                =280 cm squ.

so now subtract the area of margin from wall

=1120-280

=940 cmsqu is remaining i hope it might helped you thank u