Question

Diameter of a sphere is $28$ cm. Find its surface area(in $c{m}^2$).

Answer 1

Given, diameter $d=28cm$.

$\therefore$ radius $=\frac{d}{2}=\frac{28}{2}=14cm$.

Then, surface area of a sphere of radius $\left(r\right)$ $=4\pi r^2$

$=4\times \frac{22}{7}\times 14\times 14$

$=2464{cm}^2$.

Therefore, the required surface area of the sphere is $2464{cm}^2$.