Question

Find the surface area of a sphere whose radius is $3cm$. $(\pi =3.14)$.

Answer 1

Given, Radius $\left(r\right)=3cm$
$\therefore$ Surface area of a sphere $=4\pi r^2=4\times 3.14\times 3^2$
$=4\times 3.14\times 9=113.04{cm}^2$.