They are complements when they add to 90 degrees, making a right angle.
For example 60 degrees and 30 degrees, or 23 degrees and 67 degrees.
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In geometry and mathematics, opposing angles are called verticals. They share the same vertex, but they still are vertically opposite of one another.
Adjacent angles
Complements or complementary events
Vertically opposite 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.