Proving Parallel Lines

Front

What are parallel lines?

Back

Lines that never intersect 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 vertical angles?

Back

Angles that are opposite each other when two lines intersect.

Front

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

Back

They are equal.

Front

If two lines are cut by a transversal and the alternate interior angles are equal, what can be concluded?

Back

The two lines are parallel.

Front

What is the relationship between the sum of interior angles on the same side of a transversal?

Back

They are supplementary (add up to 180 degrees).

Front

If angle 1 and angle 2 are corresponding angles, what can be said about lines a and b?

Back

Lines a and b are parallel.

Front

What is the definition of supplementary angles?

Back

Two angles that add up to 180 degrees.