Parallel Lines and Transversals

What are parallel lines?

Lines that never intersect.

What is a transversal?

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

What does supplementary mean?

Angles that add up to 180.

What are corresponding angles?

Angles in the same position at each crossing.

What is the relationship between corresponding angles?

Congruent.

What are vertical angles?

Angles opposite each other at an intersection.

What is the relationship between vertical angles?

Congruent

What are alternate interior angles?

Angles inside the parallel lines, on opposite sides of the transversal.

What is the relationship between alternate interior angles?

Congruent

What are alternate exterior angles?

Angles outside the parallel lines, on opposite sides of the transversal.

What is the relationship between alternate exterior angles?

Congruent.

What are same-side interior angles?

Angles inside the parallel lines, on the same side of the transversal.

What is the relationship between same-side interior angles?

Supplementary

What are same-side exterior angles?

Angles outside the parallel lines, on the same side of the transversal.

What is the relationship between same-side exterior angles?

Supplementary

What is a linear pair?

Side-by-side angles on a straight line.

What is the relationship between angles in a linear pair?

Supplementary.

Which angle pairs are congruent?

Corresponding angles, vertical angles, alternate interior angles, alternate exterior angles.

Which angle pairs are supplementary?

Same-side interior angles, same-side exterior angles, linear pair.