Not all corresponding angles are equal. Corresponding angles are equal if the transversal intersects two parallel lines. ... Exterior angles on the same side of the transversal are supplementary if the lines are parallel. Similarly, interior angles are supplementary if the two lines are parallel.

What must be true for corresponding angles?

The term corresponding angles is often used when two lines are cut by a third line, a transversal . The Corresponding Angles Postulate states that if k and l are parallel , then the pairs of corresponding angles are congruent . The converse of this theorem is also true.

Do corresponding angles have to be equal?

Are all Corresponding Angles Equal? No, all corresponding angles are not equal. The corresponding angles which are formed when a transversal intersects two parallel lines are equal.