Complementary angles in geometry are two angles whose measures sum to 90 degrees. Complementary angles are more often represented by the symbol "∠" followed by two letters. For instance, angles A and B can be written as ∠A + ∠B = 90° if they are complementary.
Numerous different types of figures, such as triangles, quadrilaterals, and other polygons, contain complementary angles. They are often used in geometry to determine missing angle measurements or to demonstrate the similarity or congruence of particular figures.
In many real-world applications, such as engineering and construction, where they are used to create structures, complementary angles play an important role. They are a subject of study in trigonometry and geometry as well.
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