Question

Mary wants to decorate her Christmas tree. She wants to place the tree on a wooden block covered with coloured papers with picture of Santa Claus on it. She must know the exact quantity of paper to buy for this purpose. If the box has length, breadth and height as 80 cm, 40 cm and 20 cm respectively. How many square sheets of paper of side 40 cm would she require? If she wishes to put golden ribbon along the edges, find the length of the ribbon. ​

Answer 1

Lenght-80cm

Breadth-40cm

Height-20cm

We have to find the area of CUBOIDAL box

-Area of CUBOID-2(lb+bh+hl)

PUT THE VALUES IN THE FORMULA

=2(80×40+40×20+20×80)

=2(3200+800+1600)

=2(5600)

=11,200 cm sq

Therefore Area of box =11,200cm sq

NOW WE WILL FIND THE SHEETS REQUIRED

Square sheets required= Area of box÷square sheets of 40cm

=11,200÷40

=280 SHEETS

THEREFORE SHEETS REQUIRED ARE 280.

PLS MARK THIS AS BRAINLIEST ANSWER

THANKS FOR YOUR TIME.

Answer 2

$\bf{\underline{\underline{Answer:}}}$

• Area of cloth = 11200 cm²
• Number of required sheets = 7 sheets
• Length of the ribbon = 560 cm

$\bold{\underline {Given:}}$

Dimensions of box,

• length (l) = 80 cm
• breadth (b) = 40 cm
• height (h) =20cm

Side of square sheets = 40 cm.

$\bold{\underline {To\:find:}}$

• The exact quantity of paper =?
• Number of required sheet =?
• Length of the ribbon =?

$\bf{\underline{\underline{Step\: by\: step \:explanation:}}}$

The exact quantity of paper = T. S. A of cuboid

=2(lb+bh+hl)

=2(80×40+40×20+20×80)

=2(3200+800+1600)

=2(5600)

=11200 cm²$<hr>$ Area of square sheet = (side)²

=(40) ²

=1600cm²

$\bf Number \:of \:required \\ \bf sheets= \tt\dfrac{exact\: quantity \:of \:paper}{area \:of \:square\: sheet}$

$= \dfrac{11200}{1600}\\ \\ \bf{=7\: sheets}$ $<hr>$ The length of the ribbon = 4(l+b+h)

=4(80+40+20)

=4(140)

=560 cm