Parallel lines

7.1 Outline

1. Greek (Euclidean) geometry
   1. undefined terms
      1. point
      2. line
      3. plane
      4. surface
   2. categories
      1. traditional (Euclidean) geometry
      2. transformational geometry
   3. Euclid’s postulates
      1. postulate
      2. axiom
      3. theorem
      4. five postulates
   4. parallel lines
   5. non-Euclidean geometries
   6. straightedge
   7. line segment
   8. congruent figures
   9. construct a figure
      1. construct a circle
      2. construct