Adjacent angles share a ray.
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Adjacent angles.
adjacent angles mean next to, need a common ray or vertex.
bisector
complementary angles
It meets all definitions I can find, and it would seem that a straight angle can be adjacent. Definition: (1) Two angles that share a common side and a common vertex, but do not overlap. (2) An adjacent angle is either of two angles having a common side and a common vertex. Adjacent angles are angles that have a common ray coming out of the vertex going between two other rays. Another way of saying this is that adjacent angles are next to one another, side by side or adjacent. (Hence the name) It is an angle next to another one in a polygon.