Angle Relationships with Parallel Lines and 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

What are Alternate Exterior Angles?

Back

Alternate exterior angles are pairs of angles that lie outside the two lines and on opposite sides of the transversal. They are congruent when the lines are parallel.

Front

What are Corresponding Angles?

Back

Corresponding angles are pairs of angles that are in the same position on different parallel lines in relation to the transversal. They are congruent when the lines are parallel.

Front

What are Same-Side Interior Angles?

Back

Same-side interior angles are pairs of angles that lie on the same side of the transversal and between the two lines. They are supplementary when the lines are parallel.

Front

What is the relationship between Supplementary Angles?

Back

Supplementary angles are two angles whose measures add up to 180 degrees.

Front

What is the relationship between Congruent Angles?

Back

Congruent angles are angles that have the same measure.

Front

If ∠1 and ∠4 are vertical angles, what can be said about their measures?

Back

The measures of ∠1 and ∠4 are equal.

Front

If two lines are parallel, what can be said about the corresponding angles formed by a transversal?

Back

The corresponding angles are congruent.

Front

What is the sum of the measures of same-side interior angles when the lines are parallel?

Back

The sum of the measures of same-side interior angles is 180 degrees.

Front

What is the definition of a Transversal?

Back

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