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 in the same plane.

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 lines; they are congruent if the lines are parallel.

Front

What are alternate exterior angles?

Back

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

Front

What are supplementary angles?

Back

Two angles that add up to 180 degrees.

Front

What are congruent angles?

Back

Angles that have the same measure.

Front

If two lines are parallel, what can be said about the angles formed by a transversal?

Back

Certain pairs of angles (corresponding, alternate interior, and alternate exterior) will be congruent.

Front

What is the relationship between vertical angles?

Back

Vertical angles are always congruent.

Front

If angle C and angle P are supplementary, what is the sum of their measures?

Back

The sum of their measures is 180 degrees.