1. Lesson 18Power Up DPage 114 Lines and Angles

2. Lines – No end, extends in both directions forever. Segments – Two endpoints, length can be measured. Lines and Segments

3. Ray – one endpoint, extends in one direction forever. Planes – a flat two-dimensional surface Rays and Planes

4. Parallel – Do not cross Perpendicular – Intersect and form right angles Oblique – Intersect but not perpendicular or not vertical or horizontal Types of Lines

6. Formed by 2 rays with a common endpoint (vertex) Naming Angles B A C 1

7. Two Angles that form a straight angle (180°). Linear Pair

8. Classifying Angles

9. Practice Problems