Question

vertical angles are

Explanation:

Vertical angles are formed when two lines intersect. By the vertical angles theorem, vertical angles are always congruent (i.e., they have equal measures). Adjacent angles share a common side and vertex but vertical angles do not. Complementary angles add up to \(90^{\circ}\), supplementary angles add up to \(180^{\circ}\), and right angles are \(90^{\circ}\) - none of these are general properties of vertical angles. Only congruence is a universal property of vertical angles.

Answer:

D. congruent