Question

If the surface area of sphere is $616c{m}^2$, find its radius.

Answer 1

Given, surface area of sphere = $616c{m}^2$

$\Rightarrow 4\pi r^2=616$

$\Rightarrow 4\times \frac{22}{7}\times r^2=616$

$\Rightarrow r^2=616\times \frac{7}{4}\times \frac{1}{22}$

$\Rightarrow r^2=49$

$\Rightarrow r=7cm$

$\therefore$ Required radius, $r=7cm$