Angle Relationships with Parallel Lines and a Transversal

Front

What are corresponding angles?

Back

Angles that are in the same position on two parallel lines cut by a transversal. They are congruent.

Front

What are alternate interior angles?

Back

Angles that are on opposite sides of the transversal and inside the two parallel lines. They are congruent.

Front

What are alternate exterior angles?

Back

Angles that are on opposite sides of the transversal and outside the two parallel lines. They are congruent.

Front

What are same-side interior angles?

Back

Angles that are on the same side of the transversal and inside the two parallel lines. They are supplementary.

Front

What are same-side exterior angles?

Back

Angles that are on the same side of the transversal and outside the two parallel lines. They are supplementary.

Front

What are vertical angles?

Back

Angles that are opposite each other when two lines intersect. They are congruent.

Front

If ∠6 is 50°, what is the measure of ∠2 if they are corresponding angles?

Back

∠2 is also 50°.

Front

If ∠1 is 70°, what is the measure of ∠8 if they are alternate exterior angles?

Back

∠8 is also 70°.

Front

If ∠3 and ∠4 are vertical angles, and ∠3 measures 40°, what is the measure of ∠4?

Back

∠4 is 40°.

Front

If ∠2 and ∠8 are same-side exterior angles, and ∠2 measures 120°, what is the measure of ∠8?

Back

∠8 is 60°.