Discuss how distance is the absolute value of the difference between two points on a line and how those two points define a segment of the line.
Present the segment addition postulate.
Provide examples that involve segments and their measures (ex. Points A, B, C, and D are collinear, in that order. Find BC if AC = 2x + 4, BC = x, BD = 3x + 1, and AD = 17).
This packet should help a learner seeking to understand segments and their measures.
This video explains the relationship between distance and line segments.
Source: RobertOB on Guaranteach
This video explains how line segments are added. It also presents the line segment postulate: that if B is between A and C, then AB + BC = AC.
Source: RobertOB on Guaranteach