Parallel Lines and Transversals

Front

What are parallel lines?

Back

Parallel lines are lines in a plane that never meet. They are always the same distance apart and have the same slope.

Front

What is a transversal?

Back

A transversal is a line that crosses at least two other lines in the same plane.

Front

What are corresponding angles?

Back

Corresponding angles are pairs of angles that are in similar positions at each intersection where a transversal crosses two lines.

Front

What are alternate interior angles?

Back

Alternate interior angles are pairs of angles that are on opposite sides of the transversal and inside the two lines.

Front

What are alternate exterior angles?

Back

Alternate exterior angles are pairs of angles that are on opposite sides of the transversal and outside the two lines.

Front

What are vertical angles?

Back

Vertical angles are the angles opposite each other when two lines cross. They are always equal.

Front

What does it mean for angles to be supplementary?

Back

Supplementary angles are two angles whose measures add up to 180 degrees.

Front

What does it mean for angles to be congruent?

Back

Congruent angles are angles that have the same measure.

Front

If angle 1 and angle 5 are corresponding angles, what can be said about their measures?

Back

If angle 1 and angle 5 are corresponding angles, then they are equal in measure.

Front

If angle 3 and angle 6 are alternate interior angles, what can be said about their measures?

Back

If angle 3 and angle 6 are alternate interior angles, then they are equal in measure.