Question

The length, breadth, and height of a rectangular box are 80 cm, 40 cm, and 20 cm, respectively. If a square paper of 40 cm length is to be glued on it, how many such papers will be required?
3

Answer 1

Answer:

Step-by-step explanation:

length = 80 cm

breadth = 40 cm

height = 20 cm

The quantity of paper required will be equal to Total Surface area of the rectangular box which is in form of cuboid.

TSA of box = 2(lb + bh+ lh)

                        = 2(80*40 + 40*20 + 80*20)

                        = 2(3200+800+1600)

                        = 11200 sq. cm.

Area of  each sheet of paper = 40 * 40 = 1600 sq. cm

Number of sheets required =  11200/1600 = 7 sheets.