Angles opposite one another at the intersection of two lines are called

• A. Adjacent angles
• B. Alternate angles
• C. Corresponding angles
• D. Vertical angles

Answer: (D)

When two lines cross, the angles that are opposite each other at the intersection are equal. This happens because the two lines create a kind of mirror image across the point where they cross, so the pair of opposite angles share the same two lines as sides but in opposite directions. These opposite angles are known as vertical angles, and their equality is a standard property of intersecting lines.

The other terms describe different setups: adjacent angles share a side and lie next to each other, and they form a straight line together so they sum to 180 degrees. A transversal cutting two lines creates alternate angles or corresponding angles, which are defined by the particular positions relative to the transversal, not by opposite angles at a single intersection.