Parallel Lines and Angle Measures

Front

What are parallel lines?

Back

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

Front

What is the definition of corresponding angles?

Back

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

Front

What are alternate interior angles?

Back

Alternate interior angles are pairs of angles that are on opposite sides of the transversal and inside the two parallel lines.

Front

What are alternate exterior angles?

Back

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

Front

What are consecutive interior angles?

Back

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

Front

How do you identify corresponding angles in a diagram?

Back

Look for angles that are in the same relative position at each intersection of the transversal with the parallel lines.

Front

What is the relationship between corresponding angles when parallel lines are cut by a transversal?

Back

Corresponding angles are equal when the lines are parallel.

Front

What is the relationship between alternate interior angles when parallel lines are cut by a transversal?

Back

Alternate interior angles are equal when the lines are parallel.

Front

What is the relationship between alternate exterior angles when parallel lines are cut by a transversal?

Back

Alternate exterior angles are equal when the lines are parallel.

Front

What is the relationship between consecutive interior angles when parallel lines are cut by a transversal?

Back

Consecutive interior angles are supplementary (add up to 180 degrees) when the lines are parallel.