No, adjacent angles do not have to be 90 degrees. Adjacent angles are two angles that share a common vertex and a common side but do not overlap. The sum of adjacent angles depends on their position and the lines they are formed by. For example, if two adjacent angles are formed by two intersecting lines, they are called linear pairs and their sum is 180 degrees. However, adjacent angles can be of any measure as long as they share a common vertex and side.
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