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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.
1 Both pairs of opposite sides are parallel. ( 2 By definition). 3  Or: 4  Both pairs of opposite sides are congruent. 5  If they are congruent, they must also be parallel. 6  Or: 7  One pair of opposite sides are congruent and parallel.