Parallel Lines and Transversals

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 corresponding angles?

Back

Corresponding angles are pairs of angles that are in similar positions at each intersection where a transversal crosses two lines.

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 congruent.

Front

How can you identify corresponding angles in a diagram?

Back

Corresponding angles can be identified by their position; they are located in the same relative position at each intersection.

Front

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

Back

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

Front

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

Back

When two parallel lines are cut by a transversal, corresponding angles are congruent.

Front

What is the relationship between vertical angles?

Back

Vertical angles are always congruent, regardless of whether the lines are parallel.

Front

What is the sum of the angles on a straight line?

Back

The sum of the angles on a straight line is 180 degrees.