Question

which is not an angle formed by parallel lines and a transversal?
corresponding angles
exterior angles
same-side interior angles
alternate interior angles

Explanation:

Step1: Recall angle types

When parallel lines are cut by a transversal, corresponding angles (e.g., $\angle1$ and $\angle5$ in standard diagram), same - side interior angles (e.g., $\angle3$ and $\angle5$), and alternate interior angles (e.g., $\angle3$ and $\angle6$) are formed.

Step2: Analyze "Exterior Angles"

Just "Exterior Angles" is too general. There are alternate exterior angles (e.g., $\angle1$ and $\angle8$) and corresponding exterior angles (e.g., $\angle1$ and $\angle7$ when considering exterior positions more precisely related to parallel - transversal set - up). But the term "Exterior Angles" alone (without proper qualifying like alternate or corresponding) is not a specific, standard angle type formed by parallel lines and a transversal in the typical classification taught in geometry.

Answer:

B. Exterior Angles