Question

Math class 9 chapter 13 example 1​

Answer 1

Step-by-step explanation:

Length is 80cm b is 40cm. h is 20cm

the surface area of box is 2(lb+bh+hl)

2{(80×40)+(40×20)+(20×80)} cm square

2{3200+800+1600}cm square

2×5600cm square =11200 cm square

the area of each sheet of paper =40×40 cm square

1600 cm square

therefore,number of sheets required =surface area of box by

area of cone sheet of paper

=11200 by 1600= 7

I hope this may help u....