Question

keya needs to cover a wooden block with a chart paper for her project.if the length, breadth and height of the box are 80 cm,40cm and 20 cm. How many square sheets od paperof side 40cm would sje recquire?

Answer 1

Given:
l= 80 cm , b = 40 cm, h=20 cm
Side of a square sheet= 40 cm

Wooden box is in the shape of cuboid.

Surface area of the box = 2(lb+bh+hl)

= 2( 80×40 + 40×20 + 20×80)
= 2(3200+800+1600)
=2(5600)
= 11200 cm²

Surface Area of the box= 11200 cm²
Area of 1 sheet =area of square= side ×side
Area of 1 square sheet = 40 cm × 40 cm =1600 cm²

Number of square sheets required =surface area of box/ area of 1 square sheet

= 11200/1600=7

Hence,she would require 7 Square sheets.

HOPE THIS WILL HELP YOU....

Answer 2

Solution :-

Given -

Length of the box in cuboid shape = 80 cm

Breadth of the box in cuboid shape = 40 cm

Height of the box in cuboid shape = 20 cm

Surface area of the box in cuboid shape = 2(L*B + B*H + H*L)

⇒ 2(80*40 + 40*20 + 20*80)

⇒ 2(3200 + 800 + 1600)

⇒ 2*5600

= 11200 sq cm

Now, each side of the square sheet of paper = 40 cm

Area of the square sheet of paper = Side*Side

⇒ 40*40

Area of one square sheet of paper = 1600 sq cm

Number of square sheets of paper needed to cover the box in cuboid shape

Surface area of the box in cuboid shape/Area of one square sheet of paper 

⇒ 11200/1600

= 7 square sheets of paper.

So, 7 square sheets of paper will be needed to cover the box in cuboid shape.

Answer