Question

There is a hollow jar of length 28 cm with lid removed from the top and bottom. The radius of this cylindrical hollow jar is 8 cm. If we have to cover the outer surface with paper, then the area of paper that is required will be equal to:

• A. $1518{\text{cm}}^2$
• B. $1408{\text{cm}}^2$
• C. $1428{\text{cm}}^2$
• D. $1498{\text{cm}}^2$

Answer 1

The correct option is B

$1408{\text{cm}}^2$

Radius of the cylinder $=8\text{cm}$

Height of the cylinder $=28\text{cm}$

Paper required = Curved Surface Area of the cylinder.

$=2\pi rh$

$=2\times \frac{22}{7}\times 8\times 28$

$=1408{\text{cm}}^2$