Question

In a building there are $10$ cylindrical pillars . The radius of each pillar is $63$ cm and height is $15$ m. Find curved surface area of four pillars.

• A. $22016m^2$
• B. $237.6m^2$
• C. $2476m^2$
• D. None

Answer 1

Answer: (B)

$237.6m^2$

Given, $r=63$ cm, $h=15$ m, $h=15\times 100$ cm

Curved surface area $=2\pi rh$

$=2\times \frac{22}{7}\times 63\times 15\times 100$

$=594000{cm}^2$

Total number of pillars $=4$

CSA of one pillar $=594000$

CSA of 4 pillars $=594000\times 4=2376000$ $=$ $237.6m^2$