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A linear pair is formed when two adjacent angles have their non-common side in opposite rays. Their measures will always add up to 180 degrees. Vertival angles are formed by two intersecting lines. Two pairs are formed; they are across from each other (not adjacent), and are congruent.
More About Linear Pair. 1  The sum of the measure of the angles in a linear pair is supplementary or 180Â°. 2  If one angle of a linear pair is acute (below 90Â°), then the other angle is obtuse (above 90Â°).