Question

Find the total surface area of a cone, if its radius $14$ m and slant height $49$ m. (Use $\pi =\frac{22}{7}$).

• A. $2762$ $m^2$
• B. $2772m^2$
• C. $1772m^2$
• D. $2672m^2$

Answer 1

The correct option is B $2772m^2$

Given $r=14m,s=49m$

Then, Surface area of a cone

$=$ $\pi rs+\pi r^2$

$=\frac{22}{7}\times 14\times 49+\frac{22}{7}\times 14\times 14$

$=2156+616$

$=2772m^2$.

Therefore, option $B$ is correct.