Question

If the total surface area of a cube is $726$ m${}^2$, what is the length of a side of the cube in meters?

Answer 1

We know that total surface area of a cube of side $s=6s^2$.

Here the total surface area $=726$ m${}^2$, and if we consider the side $=s$,
$726=6\times s^2$,

$⟹\frac{726}{6}=s^2$,

$⟹121=s^2$,

$⟹s=\sqrt{121}=\sqrt{11\times 11}=11$

$⟹s=11$ m${}^2$