Parallel lines cut by a transversal

Front

What are parallel lines?

Back

Lines in a plane that never meet and are always the same distance apart.

Front

What is a transversal?

Back

A line that crosses at least two other lines.

Front

What are same side exterior angles?

Back

Angles that are on the same side of the transversal and outside the parallel lines.

Front

What are same side interior angles?

Back

Angles that are on the same side of the transversal and between the parallel lines.

Front

What are alternate interior angles?

Back

Angles that are on opposite sides of the transversal and between the parallel lines.

Front

What are alternate exterior angles?

Back

Angles that are on opposite sides of the transversal and outside the parallel lines.

Front

If two parallel lines are cut by a transversal, what can be said about the same side interior angles?

Back

They are supplementary (add up to 180 degrees).

Front

If angle 6 is 25 degrees, what is the measure of angle 7?

Back

155 degrees (since they are same side exterior angles).

Front

If angle 1 is 135 degrees, what is the measure of angle 3?

Back

135 degrees (since they are corresponding angles).

Front

What is the relationship between alternate interior angles when two parallel lines are cut by a transversal?

Back

They are congruent (equal in measure).