Question

a cylindrical pillar is 28 CM in diameter and 3 metre height what is its curved surface area​

Answer 1

Answer:

$curved surface area = 2\pi \: rh \\ = 2 \times \frac{22}{7} \times \frac{28}{2} \times 3 \times 100 \\ = 26400 {cm}^{2}$

Answer 2

Answer:

A cylindrical pillar is 28 cm in diameter and 3 metre height then its curved surface area​ is 26400 sq. cm.

Step-by-step explanation:

The curved surface area​  = 2πrh

Given:

Diameter (d) = 28 cm

Radius (r) = 28/2 = 14 cm

height (h) = 3 meter = 300 cm

Find: The curved surface area​  

The curved surface area​  = 2πrh

$= 2 \times \frac{22}{7} \times 14 \times300\\= 2 \times 22 \times 2 \times 300\\= 44 \times 6\\= 26400sq. cm$

Hence, its curved surface area​ is 26400 sq. cm.