Parallel Lines and Transversals

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

Define 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 at each intersection where a transversal crosses two lines.

Front

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

Back

They are supplementary (add up to 180°).

Front

What are vertical angles?

Back

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

Front

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

Back

They are equal.