Question

what is the relationship between $\angle a$ and $\angle b$?
choose 1 answer:
a vertical angles
b complementary angles
c supplementary angles
d none of the above

Explanation:

Vertical angles are formed when two lines intersect, and they are opposite each other, sharing a common vertex. In the diagram, ∠a and ∠b are formed by the intersection of two lines, so they are vertical angles. Complementary angles sum to 90° and supplementary to 180°, which doesn't apply here.

Answer:

A. Vertical angles