Parallel Lines and Transversals

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 in the same plane.

Front

What are corresponding angles?

Back

Angles that are in the same position at each intersection where a transversal crosses two lines.

Front

What are alternate interior angles?

Back

Angles that are on opposite sides of the transversal and inside the two lines.

Front

What are alternate exterior angles?

Back

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

Front

What is the relationship between alternate exterior angles when lines are parallel?

Back

They are congruent (equal in measure).

Front

What is the relationship between corresponding angles when lines are parallel?

Back

They are congruent (equal in measure).

Front

What is the relationship between alternate interior angles when lines are parallel?

Back

They are congruent (equal in measure).

Front

What are supplementary angles?

Back

Two angles that add up to 180 degrees.

Front

What are vertical angles?

Back

Angles that are opposite each other when two lines intersect; they are congruent.