Question

Find the lateral or curved surface area of a closed cylindrical petrol storage tank is $4.2m$ in diameter and $4.5m$ high.

• A. $2\times \frac{22}{7}\times \frac{21}{10}\times \frac{45}{10}{m}^2$
• B. $2\times \frac{12}{7}\times \frac{21}{10}\times \frac{45}{10}{m}^2$
• C. $2\times \frac{22}{7}\times \frac{11}{10}\times \frac{45}{10}{m}^2$
• D. $2\times \frac{22}{7}\times \frac{21}{10}\times \frac{35}{10}{m}^2$

Answer 1

The correct option is A $2\times \frac{22}{7}\times \frac{21}{10}\times \frac{45}{10}{m}^2$

Curved Surface Area of a Cylinder of Radius "R" and height "h" $=2\pi Rh$
Radius of the cylindrical tank $=\frac{Diameter}{2}=2.1m=\frac{21}{10}$
Hence,,

CSA of the given cylindrical tank $=2\times \frac{22}{7}\times \frac{21}{10}\times \frac{45}{10}=59.4sqm$