They are congruent.
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Vertically opposite angles are the angles that are opposite each other when two lines cross. Vertical means they share the same vertex.
equal
Where two straight lines cross the "vertically opposite" angles are equal.
If one angle is right, then all angles are right. The diagonals of a parallelogram bisect each other. Opposite angles are congruent. Opposite sides are congruent. Consecutive angles are supplementary.
4 i think. Because there are 8 different angles formed and putting them together as vertical oppisites makes 4. hope this is right :)