1. LT 3.1: Identify parallel lines, perpendicular lines, skew lines and angles formed by two lines and a transversal

3. Math Humor Line l: “Look out! You almost intersected me!!”
Line m: “Well skew’s me!!!”

4. Identify each of the following.
1) One pair of perpendicular
segments.
2) One pair of skew
3) One pair of parallel segments.
4) One pair of parallel planes.

5. Transversal: a line that intersects two coplanar lines at two distinct points.
Line t is the transversal of lines a and b. t A b

6. Corresponding angles: angles that lie on the
same side of the transversal and in corresponding
positions    

7. a b Alternate interior angles: nonadjacent interior
angles that lie on the opposite sides of the transversal a b t    

8. a b Alternate exterior angles: nonadjacent exterior
angles that lie on the opposite sides of the transversal a b t    

9. Same-side interior angles: interior angles
that lie on the same side of the transversal  
 

10. Example 2: 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 3: 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 n m

12. Before you leave…
Given: <1 and <2 are supplementary, <1 and <3 are vertical angles Prove: <2 and <3 are supplementary