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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.
Linear Pair Postulate If two angles form a linear pair, then the measures of the angles add up to 180Â°. Vertical Angles Postulate If two angles are vertical angles, then they are congruent (have equal measures). Parallel Lines Postulate Through a point not on a line, exactly one line is parallel to that line.