What is the relationship between adjacent angles?

Adjacent angles are defined as pairs of angles that share a common vertex and a common side. This relationship means that they are positioned next to each other in such a way that one angle is immediately next to another, without any overlap in their interior spaces.

Understanding this concept is crucial because it emphasizes the structural characteristics of adjacent angles. They do not have to add up to any specific measure, such as 90 degrees, nor do they need to be equal. The important aspect is their geometric arrangement that allows them to be identified as adjacent.

In summary, the defining feature of adjacent angles is the shared vertex and side, which differentiates them from other types of angles that may or may not have relationships such as being complementary or equal.