Question

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

Answer 1

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

Since, the surface area of sphere $=4\pi r^2$

Therefore,

$4\pi r^2=616$

$\pi r^2=154$

$r^2=49$

$r=7cm$

Hence, the radius of the sphere is $7cm$.