1. Chapter 1-2 (Segments and Congruence)
What are postulates?
A rule in geometry that is accepted without proof, it is given.

2. Chapter 1-2 (Segments and Congruence)
Postulate 1: Ruler
Points on a line can be matched to numbers (coordinates)
Distance between points can be written as absolute value of distance between coordinates

3. Chapter 1-2 (Segments and Congruence)
Example
Measure the length of the line segment given to you (in cm). Have your shoulder partner confirm

4. Chapter 1-2 (Segments and Congruence)
Postulate 2: Segment Addition
If B is between A and C, then AB + BC = AC
If AB + BC = AC, then B is between A and C

5. Chapter 1-2 (Segments and Congruence)
Example

6. Chapter 1-2 (Segments and Congruence)
Example
Use the Segment Addition Postulate to write an equation, then solve to find the KL

7. Chapter 1-2 (Segments and Congruence)
Example

8. Chapter 1-2 (Segments and Congruence)
What are congruent segments?
Line segments that have the exact same length.
Lengths are EQUAL (AB = CD)
Segments are CONGRUENT (AB = CD) A B C D

9. Chapter 1-2 (Segments and Congruence)
Example