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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.
two angles are congruent if they have the same measure so if two separate angles have measures of 30 and 23 for example they are not congruent because they have different measures congruent angles may lie in different orientations or positions