Question

If radius is 21 cm and height is 5 cm, find (i) curved surface area (ii) total surface area​

Answer 1

Answer:

let it be a cylinder if I'm not wrong.

Step-by-step explanation:

Radius of the base = 21 cm

Height = 5 cm

(i) curved surface area = 2 pi r h

= 2 × 22/7 × 21 × 5

= 2 × 22 × 3 × 5

= 44 × 15

= 660 sq cm

(ii) total surface area = pi r sq. h

= 22/7 × 21 × 21 × 5

= 22 × 21 × 3 × 5

= 6930 sq cm