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
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.
