Which angles are formed by a transversal that are outside the intersected lines and alternate along the transversal?

The angles formed by a transversal that are located outside the two intersected lines and are alternate along the transversal are called alternate exterior angles. When a transversal crosses two parallel lines, it creates pairs of angles that have specific relationships; alternate exterior angles are one such pair.

These angles are positioned on opposite sides of the transversal and outside the two lines. The key characteristic of alternate exterior angles is that if the lines are parallel, these angles will always be congruent. This property makes them important in proving various geometric theorems related to parallel lines and transversals.

The other types of angles mentioned—complementary angles, adjacent angles, and supplementary angles—do not accurately describe the specific relationship of the angles in this context. Complementary angles add up to 90 degrees, adjacent angles share a common side and vertex, and supplementary angles add up to 180 degrees, none of which apply to the scenario of alternate exterior angles formed by a transversal.