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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.
In elementary geometry the word congruent is often used as follows. The word equal is often used in place of congruent for these objects. 1  Two line segments are congruent if they have the same length. 2  Two angles are congruent if they have the same measure.  Two circles are congruent if they have the same diameter.