Triangular Plot

Triangular plots are graphs of three variables. The plotted points always equal some constant value, for example three points that always come out to a hundred percent. In this example, found at http://www.dplot.com/triangle_plot.htm, the three variables are soil types (silt, clay, and sand). The graph shows what percentage of each element is found in the soil. This type of information can be useful in an archaeological or architectural context.