Opposite angles formed when two lines cross and they are equal.

• A. Alternate angles
• B. Corresponding angles
• C. Vertically opposite angles
• D. Reflex angle

Answer: (C)

Opposite angles formed where two lines intersect are equal. When two straight lines cross, they create four angles, and the angles that lie across from each other share the same vertex and are formed by the same two lines. Those opposite angles are equal, and that property is called vertically opposite angles. This matches the statement described: opposite angles at an intersection are equal. The other terms involve a transversal across two lines (alternate or corresponding angles) and require parallel lines to guarantee equality, while a reflex angle is just an angle larger than 180°, not about the equality of opposite angles at a crossing.