Question

Vertical angles must: . . Check all that apply . . A. Be a linear pair. B. Have the same vertex. . C. Be adjacent . D. Be congruent.

Answer 1

Answer: Vertical angles must have same vertex and be congruent.

Explanation:

When two lines crosses each other , the opposite angles are known as vertically opposite angles or vertical angles where "vertical" refers to the vertex .

Also we know that Vertical angles theorem says that vertical angles are always congruent.

Therefore, Vertical angles must have same vertex and be congruent.

Answer 2

The correct answers are:
B) have the same vertex
C) be congruent.

Explanation:
Vertical angles are defined as opposite angles that share only a vertex. This definition is why B is true.
Since they are opposite angles, that means that the sides of one angle will be opposite the sides of the other; since this is true, the angles must be congruent.