They are called linear pair, because their farthest sides lie on the same line.
Any two angles that add to 180 degrees are called supplementary angles.
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Two adjacent angles are considered supplementary angles. They aggregate and make an angle that measures 180 degrees.
Such angles are called complementary angles.
Two angles whose sum is 180 degrees are called supplementary angles. When two angles are supplementary, it means that the sum of their measures equals 180 degrees. This relationship is often used in geometry to solve for unknown angles or to identify complementary angles.
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.
They are called adjacent angles.