Question

choose 1 answer: a vertical angles b complementary angles c supplementary angles d none of the above

Explanation:

Step1: Recall definitions

Vertical angles: Opposite angles formed by two intersecting lines. Complementary angles: Sum to \(90^{\circ}\). Supplementary angles: Sum to \(180^{\circ}\).

Step2: Analyze \(a\) and \(b\)

\(a + b=180^{\circ}\) (they form a linear pair).

Answer:

C. Supplementary angles