Rates of change can be computed from differences in magnitudes and vice versa. Graphs can show a variety of possible relationships between two variables. Students observe and record the temperature changes of different materials in both sun and shade. Students then graph their results for each material on a single graph to show the similarities and differences between the materials in sun and shade environments. Shapes can match exactly or have the same shape in different sizes.
Lines can be parallel, perpendicular, or oblique.
Shapes on a sphere like the earth cannot be depicted on a flat surface without some distortion. The graphic display of numbers may help to show patterns, such as trends, varying rates of change, gaps, or clusters. Such patterns sometimes can be used to make predictions about the phenomena being graphed. It takes two numbers to locate a point on a map or any other flat surface. The numbers may be two perpendicular distances from a point, or an angle and a distance from a point.