When a transversal intersects two parallel lines, several pairs of angles are formed with distinct relationships. Corresponding angles are found on the same side of the transversal in matching positions and are congruent, such as 1 and 5. Alternate interior angles, like 3 and 6, lie on opposite sides of the transversal but inside the parallel lines and are also congruent. Similarly, alternate exterior anglessuch as 1 and 8are congruent but found outside the parallel lines. Consecutive interior angles (or co-interior angles), like 4 and 5, are located on the same side of the transversal and inside the parallel lines but are supplementary, meaning their measures add up to 180. These angle relationships are crucial in confirming whether two lines are parallel