Two parallel lines cut by a transversal form 8 angles. [br]There are unique properties and names for pairs of these angles.

1. When are the blue and orange lines parallel to each other? What is true about their slopes?[br]2. What do you notice about the measures of the Alternating Interior and Exterior Angles when[br]the two lines are parallel?[br]3. What is true about the measures of the Same side interior angles when the lines are parallel?[br]4. What condition must be true in order for the Same side exterior angles to be supplementary?[br]5. What is true about the lines when the alternating interior angles are not congruent?