Angles that are pairs of opposite and congruent lines formed by intersecting lines are intersections
Such angles are called vertically opposite angles.
They're just called opposite angles, and they are congruent, or their measures are equal.
Those are "vertical" angles, even if there's nothing vertical about them.
Opposite angles are equivalent when formed by two intersecting lines
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two adjacent angles formed by two intersecting tines are
Equal opposite angles.
vertical angles are always congruent...they are two nonadjacent angles formed by intersecting lines. Vertical angles are congruent..or equal in measure