Complementarity means that the sum of two angles is 180, that is, one angle is the complementary angle of the other. Complementarity means that the sum of two angles is 90. Complementarity generally means that they are complementary angles. This is a mathematical term used to describe the quantitative relationship between two angles. Adjacent complementary angles are special complementary angles, and two non-public sides of adjacent complementary angles form a straight line. Adjacent complementary angles refer to two angles with a common edge and the same vertex. These two angles are called a pair of adjacent complementary angles, and one angle can also be called the adjacent complementary angle of the other angle.