Question

The curved surface area of the cylindrical roller having radius and height as 5 cm and 14 cm respectively is equal to

• A. 420 $c{m}^2$
• B. 440 $c{m}^2$
• C. 460 $c{m}^2$
• D. 480 $c{m}^2$

Answer 1

The correct option is B 440 $c{m}^2$

Curved surface of a cylinder
= $2\pi \times r\times h$
where r is the radius and h is the height.

Curved surface area of the cylindrical roller
= $2\times \frac{22}{7}\times 5\times 14$

= 440 $c{m}^2$