Question

Find the volume of cube one face has an 81msquare

Answer 1

a^2=81

a=root81

a=9

volume of cube = a^3

=9^3

=729mcube

Answer 2

Here,

Area of one face of a cube is 81m²

The faces of a cube are in the shape of square.

We know that,

Area of square = ( side)²

Now, Given Area = 81m²

Side = √Area

= √81

= 9m .

Now,

As we know that,

Volume of cube = ( side)³

Volume

= ( Side) ³

=9³

=729m³