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

Lenght of the box, l = 20 cm
Breadth of the box, b = 12 cm
Height of the box, h = 10 cm

∴ Surface area of the vertical faces of the box
= 2(l + b) × h
= 2(20 + 12) × 10
= 2 × 32 × 10
= 640 cm²

Also,
Total surface area of the box
= 2(lb + bh + hl)
= 2(20 × 12 + 12 × 10 + 10 × 20)
= 2(240 + 120 + 200)
= 2 × 560
= 1120 cm²

Thus, the surface area of vertical faces and total surface area of the box is 640 cm² and 1120 cm², respectively.