Congruent angles and parallel lines theorems

Front

What are congruent angles?

Back

Angles that have the same measure.

Front

What is the Corresponding Angles Theorem?

Back

If two parallel lines are cut by a transversal, then each pair of corresponding angles is congruent.

Front

What are alternate interior angles?

Back

Angles that are on opposite sides of the transversal and inside the two lines.

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 congruent.

Front

What is the Same Side Interior Angles Theorem?

Back

If two parallel lines are cut by a transversal, then each pair of same side interior angles is supplementary.

Front

What are alternate exterior angles?

Back

Angles that are on opposite sides of the transversal and outside the two lines.

Front

What is the Alternate Exterior Angles Theorem?

Back

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

Front

What is the Converse of the Corresponding Angles Theorem?

Back

If two lines are cut by a transversal and the corresponding angles are congruent, then the lines are parallel.

Front

What is the Converse of the Alternate Interior Angles Theorem?

Back

If two lines are cut by a transversal and the alternate interior angles are congruent, then the lines are parallel.

Front

What is the Converse of the Same Side Interior Angles Theorem?

Back

If two lines are cut by a transversal and the same side interior angles are supplementary, then the lines are parallel.