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 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 alternate exterior angles?

Back

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

Front

What are same-side interior angles?

Back

Angles that are on the same side of the transversal and inside the two lines.

Front

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

Back

They are equal.

Front

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

Back

They are equal.

Front

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

Back

They are supplementary (add up to 180 degrees).

Front

What is the relationship between ∠1 and ∠5 if they are corresponding angles?

Back

They are equal.