A linear pair in geometry is a set of adjacent angles whose opposing rays constitute their non-common sides. When two angles are linearly adjoining, they are always supplementary, which implies that their total sum is 180 degrees.
Many different types of figures, like triangles, quadrilaterals, and other polygons, can be found in linear pairs. For instance, because a triangle's sides are opposite rays, its three angles are always a linear pair.
In geometry, linear pairs are quite often used to indicate similarity or congruity between two figures or to find missing angle measures. They play a significant role in practical applications as well, such as construction and engineering, in which structures are designed and built.
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