1. Geometry 3-1 Parallel Lines and Angles Parallel Lines- lines that never intersect Symbol: || Perpendicular Lines- lines that intersect and make right angles Symbol: ┴ Parallel Planes- planes that do not intersect Skew lines- lines that are not coplanar, are not parallel, and do not intersect.

2. Examples Identify each of the following. a. a pair of parallel segments c. a pair of skew segments b. a pair of perpendicular segments BF || EJ BF ┴ FJ BF and CD

3. Vocabulary Transversal: A line that intersects two lines at different points. Transversal line

4. Vocabulary Corresponding angles: the same angle location but for a different intersection. B C A D B C A D congruent

5. Vocabulary Alternate Interior Angles: opposite sides of the transversal and between the parallel lines. A A B B congruent

6. Vocabulary Alternate Exterior Angles: opposite sides of the transversal and outside the parallel lines. A A B B congruent

7. Vocabulary Same-Side Interior: same side of the transversal and between parallel lines. A A B B supplementary

8. Vocabulary Same-Side Exterior Angles: same side of the transversal and outside the parallel lines. A B A B supplementary

9. 12 34 5 6 78

10. 1 2 3 4 5 6 7 8

11. 1 2 3 4 5 6 7 8 13 14 15 16 9 10 11 12