Question

the volume of a cube ,one face of which has an area of 81msquare is​

Answer 1

Given, Area of one face of a cube is 81m²

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,

We know that, Volume of cube = ( side)³

Volume

= ( Side) ³

=9³

=729m³

Therefore, Volume of cube whose one face area equals 81m² is 729m³

Answer 2

[tex]a^{2}=81\\a=\sqrt{81} \\a=9\\ volume=9*9*9=729cubic.cm