parallel lines with 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 is the relationship between corresponding angles when two parallel lines are cut by a transversal?

Back

Corresponding angles are congruent.

Front

What are alternate interior angles?

Back

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

Front

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

Back

Alternate interior angles are congruent.

Front

What are same side interior angles?

Back

Angles that are on the same side of the transversal and inside the two lines.

Front

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

Back

Same side interior angles are supplementary.

Front

What are vertical angles?

Back

Angles that are opposite each other when two lines intersect.

Front

What is the relationship between vertical angles?

Back

Vertical angles are congruent.