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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 parallel lines intersected by a transversal form corresponding pairs of angles that are congruent. Adjacent angles share a common vertex and a common ray. Two intersecting lines form pairs of adjacent angles that are supplementary. Also, two intersecting lines form pairs of congruent angles, called vertical angles. Click each term below to see an example.