Vishal wishes to cover a box of size 80 cm ×40cm×20cm using a square sheet of paper 40 cm^2.Find the number of sheets needed to cover the box. 

Asked by Cl_narayan | 17th Jul, 2019, 03:48: PM

Expert Answer:

 
Surface area of the box(Cuboid) = 2(lb + lh + bh)
                                               = 2(80 × 40 + 80 × 20 + 40 × 20)
                                               = 2(3200 + 1600 + 800)
                                               = 2(5600)
                                               = 11200 cm2
Number of sheets needed to cover the box = 11200 ÷ 40 = 280 

Answered by Yasmeen Khan | 17th Jul, 2019, 04:03: PM