# Measuring and Constructing Segments

The number that corresponds to a point on a number line is called the coordinate of the point. On the number line below, 10 is the coordinate of point A. The coordinate of point B is -4. Point C has coordinate 0 and is called the origin.

The distance between two points A and B on a number line is found by using the Distance and Ruler Postulates.

**Distance Postulate:** For any two points on a line and a given unit of measure, there is a unique positive real number called the measure of the distance between the points.

**Ruler Postulate:** Points on a line are paired with real numbers, and the measure of the distance between two points is the positive difference of the corresponding numbers.

Find out more about measuring and constructing segments by reading the explanation below.

Measuring and Constructing Segments

**Practice:** Find the length of a segment using a number line or specific measurements to answer the exercises below.

Measuring and Constructing Segments 1