Parallel Lines & Transversals Review

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 intersects two or more lines at different points.

Front

What is the Alternate Interior Angles Theorem?

Back

If two parallel lines are cut by a transversal, then each pair of alternate interior angles is equal.

Front

What is the Consecutive Interior Angles Theorem?

Back

If two parallel lines are cut by a transversal, then each pair of consecutive interior angles is supplementary (adds up to 180 degrees).

Front

What are Vertical Angles?

Back

Angles that are opposite each other when two lines intersect; they are always equal.

Front

If m∠1 + m∠2 = 180°, what can be said about lines l and m?

Back

Lines l and m are parallel.

Front

What is the relationship between Alternate Exterior Angles?

Back

If two parallel lines are cut by a transversal, then each pair of alternate exterior angles is equal.

Front

How do you find the measure of an angle when given its supplementary angle?

Back

Subtract the measure of the known angle from 180 degrees.

Front

What is the sum of the interior angles of a triangle?

Back

The sum is always 180 degrees.

Front

If two angles are complementary, what is the sum of their measures?

Back

The sum is always 90 degrees.