Question

if the surface area of a cube is 486 cm sq, find its volume? pls answer me soon as i hav exam tomorrow

Answer 1

we know that surface area of cube is 6a^2
so..
6a^2=486
a^2=486/6
a^2=81
a=root 81
a = 9 cm
so..volume of cube = a^3
=9^3
=729 cm^3 ans....