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 on two parallel lines cut by a transversal.

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 are vertical angles?

Back

Angles that are opposite each other when two lines intersect.

Front

What does it mean for angles to be supplementary?

Back

Two angles that add up to 180 degrees.

Front

What does it mean for angles to be congruent?

Back

Two angles that have the same measure.

Front

If angle 4 and angle 6 are congruent, what can we say about their measures?

Back

Their measures are equal.

Front

If angle 1 and angle 5 are corresponding angles, what can we conclude about them?

Back

They are congruent if the lines are parallel.