Length/Width/Height: These terms refer to the dimensions of an object in three-dimensional space. In this case, length refers to one side length of the square cross section.
Base: The base of a solid is typically one face or surface upon which it rests or from which other measurements are taken.
x-axis: The x-axis is the horizontal number line in coordinate systems. In this context, it is used to determine the orientation of the square cross sections.