For a pdf file of this image, click here
Go to the following link which will give you a better understanding of a cube.
Click on the following link: http://www.mathopenref.com/
Follow the following paths:
Solid Geometry > Types of solid > Cube > Cube definition and properties
Solid Geometry > Types of solid > Cube > Volume of a cube
Follow the following paths:
Solid Geometry > Types of solid > Cube > Cube definition and properties
Solid Geometry > Types of solid > Cube > Volume of a cube