Transversals and 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 a transversal?

Back

A line that crosses at least two other lines in the same plane.

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 alternate interior angles?

Back

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

Front

What are vertical angles?

Back

Angles that are opposite each other when two lines intersect.

Front

What is the sum of the angles on a straight line?

Back

180 degrees.

Front

What is the relationship between alternate exterior angles when two parallel lines are cut by a transversal?

Back

They are equal.

Front

If two parallel lines are cut by a transversal, what can be said about the same-side interior angles?

Back

They are supplementary (add up to 180 degrees).

Front

If ∠1 = 75°, what is the measure of ∠3 if ∠1 and ∠3 are corresponding angles?

Back

∠3 = 75°.

Front

If ∠2 = 105°, what is the measure of ∠4 if ∠2 and ∠4 are alternate interior angles?

Back

∠4 = 105°.