Angles Formed by Parallel Lines and a Transversal

Topic:
Angles
This applet shows the relationships between angles formed by a pair of parallel lines and a transversal.

Answer the following questions on a piece of paper. You will turn this in for credit.

What do you notice about... Alternate interior angles? Alternate exterior angles? Same side interior angles? Same side exterior angles? Corresponding angles? Will these relationships hold if the lines aren't parallel?