Size of angles in parallel lines

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 an angle?

Back

An angle is formed by two rays (sides of the angle) that share a common endpoint (the vertex).

Front

What is the sum of angles on a straight line?

Back

The sum of angles on a straight line is 180 degrees.

Front

What are corresponding angles?

Back

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

Front

What is the relationship between corresponding angles?

Back

Corresponding angles are equal when two parallel lines are 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 is the relationship between alternate interior angles?

Back

Alternate interior angles are equal when two parallel lines are cut by a transversal.

Front

What are consecutive interior angles?

Back

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

Front

What is the relationship between consecutive interior angles?

Back

Consecutive interior angles are supplementary, meaning they add up to 180 degrees.

Front

If angle z is 81 degrees, what is the measure of its corresponding angle?

Back

The measure of the corresponding angle is also 81 degrees.