Properties of Parallel Lines

Front

What are parallel lines?

Back

Lines in a plane that never meet and are always the same distance apart.

Front

What is the Corresponding Angles Postulate?

Back

If two parallel lines are cut by a transversal, then each pair of corresponding angles is equal.

Front

What are Alternate Interior Angles?

Back

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

Front

What is the Alternate Interior Angles Theorem?

Back

If two parallel lines are cut by a transversal, then each pair of alternate interior angles is equal.

Front

What are Alternate Exterior Angles?

Back

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

Front

What is the Alternate Exterior Angles Theorem?

Back

If two parallel lines are cut by a transversal, then each pair of alternate exterior angles is equal.

Front

What are Vertical Angles?

Back

Angles that are opposite each other when two lines intersect.

Front

What is the Vertical Angles Theorem?

Back

Vertical angles are always equal.

Front

If ∠1 = 75°, what is the measure of ∠2 if they are corresponding angles?

Back

∠2 = 75°.

Front

If ∠3 = 108°, what is the measure of ∠4 if they are alternate interior angles?

Back

∠4 = 108°.