Question

Radius of base of a cylinder is 20 cm and its height is 13 cm, find its curved surface area and total surface area. ( $\mathrm{\pi }$ = 3.14)

Answer 1

Radius of the cylinder, r = 20 cm

Height of the cylinder, h = 13 cm

∴ Curved surface area of the cylinder = 2$\mathrm{\pi }$rh = 2 × 3.14 × 20 × 13 = 1632.80 cm²

Also,

Total surface area of the cylinder = 2$\mathrm{\pi }$r(r + h) = 2 × 3.14 × 20 × (20 + 13) = 2 × 3.14 × 20 × 33 = 4144.80 cm²

Thus, the curved surface area and the total surface area of the cylinder is 1632.80 cm² and 4144.80 cm², respectively.