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The definition of a perfect cube is the cube of a number n is its third power. This is formula that is used for finding volume.
a square is 2 dimensional and a cube is 3 dimensional
To calculate the volume of a cube, you use the third power of the length, so for example, if the length of an edge of a cube is 3" then the volume is 3x3x3 = 27 cubic inches. As a result, any time a number is raised to the third power, we can call it cubed, much as raising it to the second power is that number squared.
It means to raise the number to the third power - that is, do a multiplication in which the number appears three times as a factor. For example, the cube (third power) of 5 is equal to 5 x 5 x 5.