1. Chapter 3: Parallel Lines and Planes 3-1: Definitions
PIB Geometry
Chapter 3: Parallel Lines and Planes
3-1: Definitions

2. 3-1 Objectives
Distinguish between intersecting lines, parallel lines, and skew lines.
Identify the angles formed when two lines are cut by a transversal.
Practice using your textbook as a resource.

3. Lines that do not intersect
Two lines that do not intersect are either parallel or skew

4. Lines and Planes Can two planes be parallel?
Can a line and a plane be parallel?

5. Names of Angles
Interior Angles: Exterior Angles: Corresponding Angles: Alternate Interior Angles: Same-Side Interior Angles:

6. Example Name a transversal line: Identify each pair of angles:
∠5 and ∠3:
∠7 and ∠3:
∠6 and ∠3:
∠8 and ∠6:

7. Self-guided notes
Use p in your textbook to complete the self-guided notes on your own or with a partner.

8. Your book does not mention this but…
It is also possible to define: Alternate exterior angles: Same-side exterior angles: