When two adjacent angles are on a straight line, they are said to be "linear pairs." In this context, the sum of the measures of the two angles is always 180 degrees. This is because a straight line forms a straight angle, which measures 180 degrees.
For example, if one angle measures 70 degrees, the adjacent angle on the straight line would measure 110 degrees (180 degrees - 70 degrees = 110 degrees). Additionally, since these two angles share a common side and vertex, they are considered adjacent.
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