Vertically opposite angles!
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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.
Adjacent angles
Adjacent angles are simply two angles that are next to one another and share one side. There is nothing else unique about these angles, and they are measured as one would measure any other angles.
Angles do not normally intersect one another, although coterminus angles may be said to.
They follow one another such as consecutive or coresponding angles