# Parallel Lines & Related Angles - edit LESSON PLAN

Recall that a transversal is a line that intersects 2 other lines at 2 distinct points.
In the applet below, the dashed brown line is a transversal that intersects

*2 parallel lines*. Take a few minutes to explore the special relationships among the various types of angle pair formed when a transversal intersects**PARALLEL LINES**.**As you do, be sure to drag the green points around to change the red and/or blue angle measures that appear.**Use your observations to correctly fill in each blank below:
When a transversal intersects PARALLEL LINES, all pairs of corresponding angles are________________________.
When a transversal intersects PARALLEL LINES, all pairs of alternate interior angles are ______________________.
When a transversal intersects PARALLEL LINES, all pairs of alternate exterior angles are ______________________.
When a transversal intersects PARALLEL LINES, all pairs of same-side interior angles are ______________________.
When a transversal intersects PARALLEL LINES, all pairs of same-side exterior angles are ______________________.