Parallel Lines Cut by a Transversal

Front

What is a transversal?

Back

A line that cuts through a set of parallel 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 is the relationship between alternate interior angles?

Back

Alternate interior angles are congruent when two parallel lines are cut by a transversal.

Front

What are same-side interior angles?

Back

Angles that are on the same side of the transversal and between the two lines.

Front

What is the sum of same-side interior angles?

Back

Same-side interior angles are supplementary, meaning they add up to 180°.

Front

If x = 8, what angle relationship is used?

Back

Alternate interior angles are congruent.

Front

If x = -4, what is the bold angle?

Back

The bold angle is 45°.

Front

What is the relationship of alternate exterior angles?

Back

Alternate exterior angles are congruent when two parallel lines are cut by a transversal.

Front

What is the definition of vertical angles?

Back

Vertical angles are the angles opposite each other when two lines intersect; they are congruent.

Front

What is the relationship of same-side exterior angles?

Back

Same-side exterior angles are supplementary when two parallel lines are cut by a transversal.