1. Postulates
Geometry 2.4

2. Postulates 1 to 4 1: Ruler Postulate (measure segments)
2: Segment Addition Postulate (add segments)
3: Protractor Postulate (measure angles)
4: Angle Addition Postulate (add angles)

3. Postulate 5
Any two points can be joined by exactly one line.
then If

4. Postulate 6
A line contains at least two points. If
then

5. Postulate 7
Two lines that intersect do so at exactly one point. If
then

6. Postulate 8
Any three non-collinear points lie in exactly one plane.
then If

7. Postulate 9
A plane contains at least three non-collinear points. If
then

8. Postulate 10
Given two points in a plane, the line joining them is on the same plane. If
then

9. Postulate 11
Two planes that intersect do so at exactly one line.
then If