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 vertical angles?

Back

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

Front

What are alternate interior angles?

Back

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

Front

What are alternate exterior angles?

Back

Angles that are on opposite sides of the transversal and outside the two lines; they are equal.

Front

What are corresponding angles?

Back

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

Front

What are supplementary angles?

Back

Two angles that add up to 180°.

Front

What are same side interior angles?

Back

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

Front

What are same side exterior angles?

Back

Angles that are on the same side of the transversal and outside the two lines; they are supplementary.

Front

If two parallel lines are cut by a transversal, what can be said about the alternate interior angles?

Back

They are equal.