Function:A function is a mathematical rule that relates one input value (x) to exactly one output value (y). For example, y = 2x is a function where for every x-value we plug in, we can determine the corresponding y-value.
Area:Area refers to the measure of how much surface or space an object occupies. In this context, it represents the two-dimensional measurement of the triangular cross section.
Cross Section:A cross section is a 2D shape formed by cutting through an object typically along a plane. In this case, it refers to the individual slices within the solid that have triangular shapes.