Angles occupying the same relative position where a transversal crosses two lines; If the two lines are parallel, they are equal.

• A. Corresponding angles
• B. Alternate angles
• C. Vertically opposite angles
• D. Transversal line

Answer: (A)

Angles occupying the same relative position where a transversal crosses two lines are called corresponding angles. When the two lines are parallel, corresponding angles are equal because the transversal meets both lines at the same orientation, so the angle it forms with each line in that same position stays the same. This lets you deduce an unknown angle at one intersection from the angle at the other intersection.

Other angle pairs exist with their own rules: alternate angles (on opposite sides of the transversal) are also equal when lines are parallel, but they’re defined by being on opposite sides, not in the same relative position. Vertically opposite angles are equal within a single intersection, not across the two intersections created by the transversal.