What is a transversal in geometry?

In geometry, a transversal is defined as a line that intersects two or more other lines. This concept is crucial in understanding the relationships between the angles formed when a transversal crosses parallel lines, as well as how it affects the angles involved with non-parallel lines. The intersections create several important angle pairs, such as corresponding angles, alternate interior angles, and consecutive interior angles, which are foundational in proving various geometric theorems.

The other choices represent different notions that do not align with the definition of a transversal. While there are various types of angles, such as those formed by a transversal with the lines it intersects, the term "transversal" specifically refers to the line itself, not the angles created. A parallel line, on the other hand, is a line that runs alongside another line at a constant distance and does not intersect it, which is distinct from a transversal. The mention of angle measurement also does not pertain to what a transversal is, as it describes a method of quantifying angles rather than defining a type of line. Understanding these distinctions is essential for mastering geometric concepts.