The lines are projected out to the right of the red arrow line just as far as where the imaginary side of the triangle will be, and their percentage abundances written along the right side of the triangle. The horizontal lines that represent various percents of A can be of any length since they run parallel to the base line and remain the same distance from the bottom and top of the triangle.
Any other percentage can be indicated by a line appropriately located along the line between 0% and 100%, as shown by the numbers off to the right. A horizontal bar at the bottom of the line (farthest from A) represents 0% of A. A point plotted at the top of the vertical line nearest A indicates 100% A. Along this line is indicated percent of A. Point A is at the top of the heavy vertical red line (arrow). The drawing to the left has only the skeleton of the triangle present as we concentrate on point A. We are going to take the diagram apart to see how it works. For the moment they are labeled A, B, and C. A ternary diagram is a triangle, with each of the three apexes representing a composition, such as sandstone, shale, and limestone.
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