1. Lesson 3.1 AIM: Properties of Parallel Lines
DO NOW: Name an angle congruent to angle 2.
Angles 2, 3, 6, and 7 are congruent.

2. A transversal is…
A line that intersects two or more lines at different points.

3. Which angles are alternate interior angles?
Angles 3 and 6.
Angle 4 and 5.
Alternate Interior Angles
are congruent.

4. Which angles are same side interior angles?
Angles 3 and 5.
Angle 4 and 6.
Same Side Interior Angles
are supplementary.

5. Which angles are corresponding angles?
Angles 1 and 5.
Angle 2 and 6.
Angles 3 and 7.
Angles 4 and 8.
Corresponding Angles
are congruent.

6. Which angles are alternate exterior angles?
Angles 1 and 8.
Angle 2 and 7.
Alternate Exterior Angles
are congruent.

7. What is the measure of angle 5?
Corresponding Angles
are congruent.

8. What is the measure of angle PQR?
Alternate Interior Angles
are congruent.

9. What is the measure of angle 9?
Alternate Exterior Angles
are congruent.

10. What is the measure of angle 6?
Same Side Interior Angles
are supplementary.

11. Find the value of x. Relationship: Corresponding Angles 125 = x + 15
110 = x

12. Summary Question