Question

the surface area of a cube is 864m square find it's volume​

Answer 1

surface area of cube=6x²=864m²

therefore,

x²=864/6=144

therefore,

x=√144=12 m

so, the volume if cube =x³=1728 m³

Answer 2

given surface area =864
$6 {a}^{2} = surface area of cube$
so ,
a^2=864÷6
a^2=144
a=√144
a=12

now volume of cube is a^3
= 12^3
=1728