Question

find the volume of a cube one face of which has an area of 81 m square

Answer 1

Solutions :-

Given :
Area of one face of a cube = 81 m²

Find the side of a cube :-

Area of a face of a cube = (side)²
=> √81 = side = 9 m

Find the volume of a cube :-

Volume of cube = (side)³ cu. units
= (9)³ m³
= 729 m³

Hence,
The volume of a cube = 729 m³

Answer 2

a cube one face of area 81 m2
side of a cube one face = √{area}
= √(81) m
= 9 m
volume = (one side)³
=( 9)³ m³
= 729 m³