Question

The diameter of the base of a right circular cylinder is $28$ cm and its height is $21$ cm Curved surface area of the cylinder is

• A. $1540$ $c{m}^2$
• B. $1848$ $c{m}^2$
• C. $1648$ $c{m}^2$
• D. $1548$ $c{m}^2$

Answer 1

Answer: (B)

The correct option is C $1848$ $c{m}^2$
$Diameter=28cm$
$\Rightarrow r=14cm$

and $h=21cm$
C.S.A of cylinder$=2\pi rh=2\times \frac{22}{7}\times 14\times 21=1848c{m}^2$