1. 3-1 Lines and Angles Warm Up Lesson Presentation Lesson Quiz
Holt Geometry
Warm Up
Lesson Presentation
Lesson Quiz

2. Do Now Identify each of the following.
1. points that lie in the same plane
2. two angles whose sum is 180°
3. the intersection of two distinct intersecting lines
4. a pair of adjacent angles whose non-common sides are opposite rays

3. Objectives TSW identify parallel, perpendicular, and skew lines.
TSW identify the angles formed by two lines and a transversal.

4. Vocabulary parallel lines perpendicular lines skew lines
parallel planes
transversal
corresponding angles
alternate interior angles
alternate exterior angles
same-side interior angles

6. Segments or rays are parallel, perpendicular, or skew if the lines that contain them are parallel, perpendicular, or skew.
Helpful Hint

7. Example 1: Identifying Types of Lines and Planes
Identify each of the following.
A. a pair of parallel segments
B. a pair of skew segments
C. a pair of perpendicular segments
D. a pair of parallel planes

8. Example 2
Identify each of the following.
a. a pair of parallel segments
b. a pair of skew segments
c. a pair of perpendicular segments
d. a pair of parallel planes

10. Example 3: Classifying Pairs of Angles
Give an example of each angle pair.
A. corresponding angles
B. alternate interior angles
C. alternate exterior angles
D. same-side interior angles

11. Example 4
Give an example of each angle pair.
A. corresponding angles
B. alternate interior angles
C. alternate exterior angles
D. same-side interior angles

12. To determine which line is the transversal for a given angle pair, locate the line that connects the vertices.
Helpful Hint

13. Example 5: Identifying Angle Pairs and Transversals
Identify the transversal and classify each angle pair.
A. 1 and 3
B. 2 and 6
C. 4 and 6

14. Example 6
Identify the transversal and classify the angle pair 2 and 5 in the diagram.

15. Lesson Quiz: Part I
Identify each of the following.
1. a pair of parallel segments
2. a pair of skew segments
3. a pair of perpendicular segments
4. a pair of parallel planes

16. Lesson Quiz: Part II
Identify each of the following.
5. one pair alternate interior angles
6. One pair corresponding angles
7. one pair alternate exterior angles
8. one pair same-side interior angles

17. Lesson Quiz: Part I
Identify each of the following.
1. a pair of parallel segments
EH || FG
2. a pair of skew segments
BF and EH
3. a pair of perpendicular segments
CG  GH
4. a pair of parallel planes
ABC and EFG

18. Lesson Quiz: Part II
Identify each of the following.
5. one pair alternate interior angles
EHG and HGK
6. One pair corresponding angles
EHG and FGJ
7. one pair alternate exterior angles
IHE and JGK
8. one pair same-side interior angles
EHG and HGF