Parallel Lines and Transversals

Front

What are parallel lines?

Back

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

Front

What is a transversal?

Back

A transversal is a line that crosses at least two other lines.

Front

What are corresponding angles?

Back

Corresponding angles are angles that are in the same position on two different parallel lines cut by a transversal.

Front

What are alternate interior angles?

Back

Alternate interior angles are angles that lie between two parallel lines on opposite sides of a transversal.

Front

What are alternate exterior angles?

Back

Alternate exterior angles are angles that lie outside two parallel lines on opposite sides of a transversal.

Front

What are consecutive interior angles?

Back

Consecutive interior angles are angles that lie between two parallel lines on the same side of a transversal.

Front

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

Back

Corresponding angles are congruent.

Front

If two parallel lines are cut by a transversal, what can be said about alternate interior angles?

Back

Alternate interior angles are congruent.

Front

If two parallel lines are cut by a transversal, what can be said about consecutive interior angles?

Back

Consecutive interior angles are supplementary (add up to 180°).

Front

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

Back

The sum of the angles on a straight line is 180°.