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## 7.1 Outline

- Greek (Euclidean) geometry
- undefined terms
- point
- line
- plane
- surface

- categories
- traditional (Euclidean) geometry
- transformational geometry

- Euclid’s postulates
- postulate
- axiom
- theorem
- five postulates

- parallel lines
- non-Euclidean geometries
- straightedge
- line segment
- congruent figures
- construct a figure
- construct a circle
- construct

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