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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 Congruent. 1  Congruent angles are angles that have the same measure. 2  An equilateral triangle has all its angles measuring 60Â°. So, the angles of an equilateral triangle are congruent. 3  A square and a rectangle have all their angles measuring 90Â°. So, the angles of a square and a rectangle are congruent.