Parallel lines cut by 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 alternate exterior angles?

Back

Angles that are on opposite sides of the transversal and outside the 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 corresponding angles?

Back

Angles that are in the same position on two different lines cut by a transversal.

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 alternate interior angles when lines are parallel?

Back

They are equal.

Front

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

Back

They are equal.

Front

What are supplementary angles?

Back

Angles that add up to 180°.

Front

What are vertical angles?

Back

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