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 corresponding angles?

Back

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

Front

What are alternate interior angles?

Back

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

Front

What are alternate exterior angles?

Back

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

Front

What are vertical angles?

Back

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

Front

If angle 1 is 135 degrees, what is angle 3?

Back

Angle 3 is 135 degrees (corresponding angles).

Front

If angle 2 is 127 degrees, what is the relationship of angle 2 to angle 4?

Back

Angle 4 is 127 degrees (alternate interior angles).

Front

What is the sum of the interior angles on the same side of the transversal?

Back

The sum is 180 degrees.

Front

What is the relationship between alternate exterior angles?

Back

They are congruent when the lines are parallel.