Question

The lateral surface area of a cube is $256c{m}^2$. find its total surface area.

Answer 1

The lateral surface area of cube $=4a^2$

Here, $4a^2=256$ [Lateral surface area is given as $256c{m}^2$]

$\Rightarrow a^2=64$

$\Rightarrow a=8cm$

So, total surface area $=6a^2=6\times 64=384c{m}^2$