Question

Marlene noticed that when a pair of parallel lines was cut by a transversal, two particular vertical angles were reflections of each other. What can she conclude from this observation?

A. the measures of the angles must be equal.

B.the angles must be complementary.

C.the angles must be supplementary.

D.the measures of the angles must add to 360°.

Answer 1

A.the measures of the angles must be equal
Vertical Angles- are the angles opposite of each other when two lines cross. They are always equal.

Answer 2

A. the measures of the angles must be equal.

Explanation:

She can conclude that the measure of the angles must be equal, because vertical angles are angles opposite each other when to lines cross, the only thing they have in common is the vertex, when this happens that pair of angles are congruent.

An image is attached to show an example of vertical angles, which are always congruent.