Question

If the diameter of a cylinder is $28$ cm and its height is $20$ cm, then total surface area (in ${cm}^2$) is:

• A. $2993$
• B. $2992$
• C. $2292$
• D. $2229$

Answer 1

Answer: (B)

$2992$

Total surface area of a cylinder of Radius "$R$" and height "$h$" $=2\pi R(R+h)$
Radius of the base of the cylinder $=\frac{28}{2}=14$ cm

Hence, total surface area of the cylinder $=2\times \frac{22}{7}\times 14(14+20)$

$=2992c{m}^2$