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A pair of adjacent angles whose non-common sides are opposite rays are called a linear pair. The measure of a straight angle is 180 degrees, so a linear pair of angles must add up to 180 degrees.
Sum of adjacent angles on a straight line.
Supplementary angles have a sum of 180 degrees.
they are called supplementary angles. a straight line has 180 degrees each side and two adjacent angles forming 180 degrees are called supplementary angles.
The angles are called supplementary if they add to 180 degrees. Where the two angles are adjacent, they form a "linear pair" such that their farthest sides lie on the same line.