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Adjacent Angles
Two angles that have a common vertex and side but have no common interior points.

Complementary Angles
Two angles that add up to 90 degrees. They can be adjacent or non-adjacent angles.


Supplementary Angles
Two angles that add up to 180 degrees. They can be adjacent or non-adjacent angles.

Linear Pair
Two angles that are adjacent and supplementary (add up to 180 degrees)

Vertical Angles
Angles that are opposite each other when two lines intersect. They are also congruent to each other.