1. Lesson 3.1 Lines Cut By A Transversal
Geometry Notes
Lesson 3.1
Lines Cut By A Transversal

2. Vocabulary
Transversal – A line that intersects two or more coplanar lines at different points 
Vertical Angles – non-adjacent, non-overlapping congruent angles formed by two intersecting lines . (They share a common vertex.)
 Linear Pairs of Angles –two adjacent angles whose non-shared rays form a straight angle
Corresponding Angles – angles that lie on the same side of the transversal and in corresponding positions relative to the parallel lines

3. Vocabulary
Alternate Interior Angles – nonadjacent angles between the parallel lines that lie on opposite sides of the transversal
Alternate Exterior Angles – nonadjacent angles outside the parallel lines that lie on opposite sides of the transversal
Same-Side Interior Angles – angles that lie on the same side of the transversal and between the parallel lines

4. Vertical Angles
Label by shading sets of vertical angles with the same color. a b c

5. Linear Pairs of Angles b a c
Label by shading linear pairs of angles with the same color. a b c

6. Corresponding Angles b a c
Label by shading sets of corresponding angles with the same color. a b c

7. Alternate Interior Angles
Label by shading sets of alternate interior angles with the same color. a b c

8. Alternate Exterior Angles
Label by shading sets of alternate exterior angles with the same color a b c

9. Same-Side Interior Angles
Label by shading sets of same-side interior angles with the same color. a b c

10. Classifying Sets of Angles Given Two Transversals
Classify the given angles as either: alternate-interior angles; same-side interior angles; alternate exterior angles; corresponding angles; vertical angles; or none of these.

11. Warm-Up 10/8/08
Use either: alternate-interior angles; same-side interior angles; alternate exterior angles; corresponding angles; vertical angles; or none of these.
Name what type of angles these sets are: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
1 & 6 : ________
2 & 10 : _______
11 & 4 : _______
12 & 7 : _______
5 & 4 : _______
14 & 15:

12. 2 & 7 : ______ 3 & 5 : ______ 7 & 14 : ______ 8 & 2 : ______
2 & 7 : ______
3 & 5 : ______
7 & 14 : ______
8 & 2 : ______
13 & 7 : ______ 11 6 1 2 3 4 5 7 8 9 10 12 13 14

13. Homework 10/6
Lesson 3-1 p.126 #22-47 (25probs)