This document discusses linear measurement and precision. It defines a line segment and explains that segments can be measured because they have endpoints. It discusses using both customary and metric rulers to measure and draw segments of different lengths. It also defines precision as the smallest unit available on a measuring tool and explains that measurements should be precise to within 0.5 units. An example is provided to find the precision of different measurements. The document notes that segments of the same measure are congruent and constructions can be used to create geometric figures without measurement tools.

1. 1.2 Linear Measure and Precision