They are simply called opposite angles.
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Perpendicular is when opposite angles that are formed when two lines intersect and are congruent called?
When 2 lines intersect, 4 angles are formed. The angles that are directly opposite to each other are called opposite angles.
Vertical angles.
vertical angles
When two lines intersect, the angles across from each other are called vertically opposite angles, or just opposite angles. Opposite angles are equal to one another. See 'related links' below.