Triangular Plot

http://stackoverflow.com/questions/12520003/representing-ternary-plot-data-for-lookups

Triangular Plots are used to show the sum of the parts of three variables. The data is shown in an equilateral triangle in order to show the ratios of the three variables. In the graph above, soil composition can be determined by using the three variables. If the know the percent of sand, clay, and silt you can determine what substance you have. Also, you can use the percentages to determine what you need if you were to make something. All the percentages will add up to 100%.