Parallel Lines and transversals

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.

Front

What are corresponding angles?

Back

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

Front

What are alternate interior angles?

Back

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

Front

What are alternate exterior angles?

Back

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

Front

What are vertical angles?

Back

Angles that are opposite each other when two lines cross.

Front

If ∠1 = 55°, what is the measure of ∠5?

Back

55° (corresponding angles are equal).

Front

If ∠3 = 45°, what is the measure of ∠7?

Back

45° (alternate interior angles are equal).

Front

If ∠2 = 135°, what is the measure of ∠6?

Back

135° (corresponding angles are equal).

Front

What is the relationship between alternate exterior angles?

Back

They are equal when the lines are parallel.