A one dimension quantity − length and it is represented as
Two dimension quantity − length and breadth. Which can be represented as
The space ocupied here: 1cm x 1cm = 1 cm2.
Two dimensional quantity is called as Area.
Definition of volume
When we expand 1 cm from the surface of 2D, it forms 3D.
The space occupied here: 1cm x 1cm x 1cm = 1 cm3.
Three dimensional quantity is called as volume.
So, volume is the space occupied by any 3D object (cone, cube, cuboid and cylinder).