adjacent angle
two angles that lie in the same plane, have a common vertex and a common side, but no common interior points
Adjacent angles are two angles that share a common side and vertex, but do not overlap. In other words, they are two angles that are right next to each other and have a common side.
For example, if we have a straight line AB, and we draw two angles – angle 1 and angle 2 – such that angle 1 is formed by line segments AB and BC, and angle 2 is formed by line segments BC and CD, then angle 1 and angle 2 are adjacent angles because they share a common side BC and a common vertex B.
It is important to note that the sum of adjacent angles is always equal to a straight angle, which measures 180 degrees. This property can be used to solve problems involving adjacent angles and finding missing angle measures.
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