In geometry, supplementary angles are two angles whose measures add up to 180 degrees. Supplementary angles are often denoted with the symbol "∠" followed by two letters to represent the angles. For example, if angles A and B are supplementary, they can be written as ∠A + ∠B = 180°.
Various different types of figures, such as triangles, quadrilaterals, and other polygons, comprise supplementary angles. They are most often used in geometry to prove that particular figures are similar or congruent or to locate missing angle measurements.
In many real-world applications, like engineering and construction, in which they are used to create structures, supplementary angles play a significant role. They are a subject of study in trigonometry and geometry as well.
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