The science of **graphics** is closely related to that of mensuration.

It is important to begin the study of **graphics** with concrete cases rather than with tracing values of an algebraic function.

These methods are set forth and exemplified in **Graphics**, by R.

While mensuration is concerned with the representation of geometrical magnitudes by numbers, **graphics** is concerned with the representation of numerical quantities by geometrical figures, and particularly by lengths.

C. Turner, **Graphics** applied to Arithmetic, Mensuration and Statics (1907).

There are also cases in which **graphics** and mensuration are used jointly; a variable numerical quantity is represented by a graph, and the principles of mensuration are then applied to determine related numerical quantities.

Graphic representation thus rests on the principle that equal numerical quantities may be represented by equal lengths, and that a quantity mA may be represented by a length mL, where A and L are the respective units; and the science of **graphics** rests on the converse property that the quantity represented by pL is pA, i.e.