Question

Find the surface area of sphere of diameter $14$ cm.

• A. $616{cm}^2$
• B. $661c{m}^2$
• C. $166c{m}^2$
• D. None of these

Answer 1

The correct option is A $616{cm}^2$

Given, diameter $d=14$ cm.

$\therefore$ radius $=\frac{d}{2}=\frac{14}{2}=7$ cm

Surface area of a sphere of radius $r$ $=4\pi r^2$

$=4\times \frac{22}{7}\times 7\times 7$

$=616{cm}^2$.

Therefore, option $A$ is correct.