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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.
congruent exactly equal in size and shape congruent sides or segments have the exact same length congruent angles have the exact same measure for any set of congruent geometric figures corresponding sides angles faces etc are congruent note congruent segments sides and angles are often marked