Question

In a building there are 4 cylindrical pillars. The radius of each pillar is 21 cm and height is 5 m. Find the curved surface area of four pillars.

Answer 1

The height of pillar is $500cm$

The radius of pillar is $21cm$

The surface area is $2\pi rh$

$2\times \frac{22}{7}\times 21\times 5006\times 22\times 500=66000$

Surface area of $4$ pillars is $4\times 66000=264000c{m}^2$