Question

Length, breadth and height of a cuboid shape box of medicine is 20 cm, 12 cm and 10 cm respectively. Find the surface area of vertical faces and total surface area of this box.

Answer 1

Given: For cuboid shape box of medicine, 

length (l) = 20 cm, breadth (b) = 12 cm and height (h) = 10 cm. 

To find: Surface area of vertical faces and total surface area of the box

Solution:

i. Surface area of vertical faces of the box 

= 2(l + b) x h 

= 2(20+ 12) x 10 

= 2 x 32 x 10 

= 640 sq.cm.

ii. Total surface area of the box 

= 2 (lb + bh + lh) 

= 2(20 x 12+ 12 x 10 + 20 x 10)

= 2(240 + 120 + 200)

= 2 x 560 

= 1120 sq.cm. 

∴ The surface area of vertical faces and total surface area of the box are 640 sq.cm, and 1120 sq.cm, respectively.