Vertical angles are always, by definition, congruent.
Note: If the two vertical angles are right angles then they are both congruent and supplementary.
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Vertical angles are not always complementary. In some cases, they will congruent and supplementary which makes them add up to 180 degrees.
Vertical angles must necessarily be congruent, however congruent angles do not necessarily have to be vertical angles. An example of congruent angles which are not vertical angles are the 3 interior angles of an equilateral triangle. These angles do not share the same vertex yet they are congruent.
supplementary angles are equal to 180 degrees. so two congruent(same) angles would be 90 degrees!
There's lots of useful things you can discover when parallel lines are cut by a transversal, most of them having to do with angle relationships. Corresponding angles are congruent, alternate interior angles are congruent, same side or consecutive interior angles are supplementary, alternate exterior angles are congruent, and vertical angles are congruent.
vertical angles