1. Parallel Lines & Angle Relationships

2. DEFINITIONS
Parallel Lines: Lines in a plane with the same slope…they never intersect
Transversal: A line that crosses parallel lines.

3. Corresponding Angles
Two corresponding angles are on the same side of the transversal.

4. Corresponding angles are on the same side of the transversal.
One belongs to the upper parallel line and the other to the
lower parallel line. 1 2 4 3 5 6 8 7
Corresponding Angles are congruent.

5. Alternate Interior Angles
Alternate Interior Angles are two inside angles on opposite sides of the transversal.

6. Alternate Interior Angles are two inside angles on opposite sides of the transversal.1 2 4 3 5 6 8 7
Alternate Interior Angles are congruent.

9. When parallel lines are cut by a transversal
Corresponding Angles are congruent.
Alternate Interior Angles are congruent.
Alternate Exterior Angles are congruent.