Vertical angles are defined as what?

Vertical angles are defined as what?

• A. Two angles that are adjacent and share a side
• B. Two angles that are across from each other, formed by intersecting lines
• C. Two angles that sum to 90 degrees
• D. Two angles that have the same vertex

Answer: (B)

Vertical angles are the angles that sit opposite each other when two lines cross. When lines intersect, four angles appear. The opposite pair across the intersection are vertical angles, and they always have the same measure. For example, if one of these angles is 50 degrees, the angle directly across from it is also 50 degrees. The angles next to them share a side and form a straight line with their adjacent angles, totaling 180 degrees, which describes a linear pair rather than vertical angles. While vertical angles share the same vertex, that alone isn’t enough to define them—the key idea is that they are the opposite angles formed by intersecting lines.

Vertical angles are the angles that sit opposite each other when two lines cross. When lines intersect, four angles appear. The opposite pair across the intersection are vertical angles, and they always have the same measure. For example, if one of these angles is 50 degrees, the angle directly across from it is also 50 degrees. The angles next to them share a side and form a straight line with their adjacent angles, totaling 180 degrees, which describes a linear pair rather than vertical angles. While vertical angles share the same vertex, that alone isn’t enough to define them—the key idea is that they are the opposite angles formed by intersecting lines.