Chapter 5 Parallel Lines and Transversals and Triangles

Front

What are parallel lines?

Back

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

Front

What is a transversal?

Back

A transversal is a line that intersects two or more lines at different points.

Front

What are alternate interior angles?

Back

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

Front

What are alternate exterior angles?

Back

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

Front

What are corresponding angles?

Back

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

Front

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

Back

The sum of the interior angles of a triangle is always 180 degrees.

Front

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

Back

To find the measure of an angle when given its supplementary angle, subtract the measure of the supplementary angle from 180 degrees.

Front

What is the relationship between angles formed by parallel lines and a transversal?

Back

When two parallel lines are cut by a transversal, the alternate interior angles are equal, the alternate exterior angles are equal, and the corresponding angles are equal.

Front

What is the definition of vertical angles?

Back

Vertical angles are the angles opposite each other when two lines intersect; they are always equal.

Front

How do you calculate the measure of an angle if you know one of its adjacent angles?

Back

If you know one of the adjacent angles, you can find the measure of the angle by using the fact that adjacent angles on a straight line sum to 180 degrees.