1. Parallel Lines Cut by a Transversal
Teacher Twins©2014

2. Warm Up
Draw the figure and find the measure of the missing angles.
105⁰
85⁰
85⁰
95⁰

3. Parallel Lines Cut by a Transversal

4. This side will be facing your notebook.
Line Definitions
Alternate Interior Angles
This side will be facing your notebook.
Alternate Exterior Angles
Corresponding Angles

5. In the center of the foldable.

6. Inside Line Definitions Flap
Perpendicular lines are lines that intersect at right angles. (Symbol )
Parallel lines are lines that do not intersect. (Symbol )
A line that intersects two or more other lines is called a transversal

7. Inside the Flap of Alternate Interior Angles
Alternate interior angles are angles on opposite sides of the transversal and inside the two parallel lines. They are congruent.
< 3 & < 6 and < 4 & < 5 are alternate interior angles

8. Inside the Flap of Alternate Exterior Angles
Alternate exterior angles are angles on opposite sides of the transversal and outside the two parallel lines. They are congruent.
< 1 & < 8 and < 2 & < 7 are alternate exterior angles

9. Inside the Flap of Corresponding Angles
Corresponding angles are angles in the same position on the two parallel lines in relation to the transversal. They are congruent.
< 1 & < 5, < 2 & < 6, < 4 & < 8 and < 3 & < 7 are corresponding angles

10. List all alternate interior angles, alternate exterior angles, and corresponding angles.
< 4 & < 5
Alternate exterior
< 1 & < 8 and
< 2 & < 7
Corresponding angles < 1 & < 5, < 2 & < 6, <3 & < 7, and < 4 & <8

11. Closure
120⁰
60⁰
60⁰
120⁰
120⁰
60⁰
60⁰
120⁰