Parallel Lines cut by a transversal

Front

What are parallel lines?

Back

Parallel lines are lines in a plane that never meet; they are always the same distance apart.

Front

What is a transversal?

Back

A transversal is a line that intersects two or more lines at different points.

Front

What are alternate interior angles?

Back

Alternate interior angles are pairs of angles that lie between two lines and on opposite sides of a transversal.

Front

What are vertical angles?

Back

Vertical angles are the angles opposite each other when two lines intersect. They are always equal.

Front

What are alternate exterior angles?

Back

Alternate exterior angles are pairs of angles that lie outside two lines and on opposite sides of a transversal.

Front

What is the relationship between alternate interior angles when lines are parallel?

Back

When two parallel lines are cut by a transversal, alternate interior angles are equal.

Front

What is the relationship between vertical angles?

Back

Vertical angles are always equal regardless of whether the lines are parallel or not.

Front

What is the relationship between alternate exterior angles when lines are parallel?

Back

When two parallel lines are cut by a transversal, alternate exterior angles are equal.

Front

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

Back

The sum of the interior angles on the same side of a transversal is supplementary, meaning they add up to 180 degrees.

Front

How can you determine if two lines are parallel using angle relationships?

Back

If alternate interior angles are equal or if corresponding angles are equal, then the lines are parallel.