A triangular plot is useful when there are exactly three variables. All three can be conveniently plotted on a two dimensional display. In the graph above, soil composition can be determined using the three variables. If you know the percent sand, clay, and silt you will be able to determine exactly what substance you have. In addition if you wanted to make silty clay loam, you would know that you need 60% silt, 25% clay, and 15% sand. All three percentages need to add up to 100%.
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