Parallel Lines and 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 intersects two or more lines at different points.

Front

What are corresponding angles?

Back

Angles that are in the same position on two parallel lines in relation to a transversal.

Front

What are alternate interior angles?

Back

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

Front

What are alternate exterior angles?

Back

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

Front

What are same-side interior angles?

Back

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

Front

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

Back

Corresponding angles are equal.

Front

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

Back

Alternate interior angles are equal.

Front

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

Back

Same-side interior angles are supplementary (add up to 180 degrees).

Front

What are vertical angles?

Back

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