1. 1-2 Linear Measure Textbook page 13

2. Review: Measuring with a ruler Find the length of using each ruler. cm in

3. Measuring a Segment Segment Addition Postulate: If C is between A and B, then AC + CB = AB. Example: If AC = x, CB = 2x and AB = 12, then, find x, AC and CB.

4. More Examples 1.Find XY. 2.Find FG.

5. Algebraic Examples 3. Find x and MN if N is between M and P, MP = 60, MN = 6x - 7, and NP = 2x + 3.

6. Congruent Segments Definition: AB: the segment AB (an object) AB: the distance from A to B (a number) Congruent segments can be marked with dashes. Also, if the measurements are the same for two segments, then the segments are congruent. Correct notation: Incorrect notation : Segments with equal lengths. (congruent symbol: )