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## 1.2 Points, Lines, and Planes

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**1.2 Points, Lines, and Planes**Objective: Understand and use the basic terms and postulates of geometry.**1.2 Vocabulary**• Point • Line • Plane • Collinear Points • Coplanar • Space • Segment • Ray • Opposite Rays • Postulate • Axiom • Intersection**Or BA or line l**Or plane ABC**Naming Points, Lines, and Planes**• How can you tell that the label P is naming a plane instead of a point? • Why is plane RQS not a valid name for the plane? • What point(s) do lines l and m have in common?**Compare and Contrast**How is naming a ray similar to naming a line? How is it different?**Naming Segments and Rays**Can the three points shown on the line be used to name a plane? Explain.**Vocab Terms:**Intersection: set of points the figures have in common Postulate or axiom: an accepted statement of fact