This is a text description of Figure 7-3, "Measures, Distances, and Their Mapping Relationship". It illustrates measures, distances, and their mapping relationship, as described in text before and after the illustration. The following calculation uses the formula and values in the illustration to determine the measure of the point at measure 60: (50/100) * (100-20) + 20 = 1/2 * 80 + 20 = 40 + 20 = 60.