Question

If the radius of Sphere s doubled find the ratio of the surface area of the new sphere to that of original sphere

Answer 1

$\frac{surface \: area \: of \: original \: sphere}{surface \: area \: of \: new \: sphere}$
$= \frac{4\pi {s}^{2} }{4\pi {2}^{2} {s}^{2} }$
$= \frac{1}{4}$
= 1:4