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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.
A parallelogram is a quadrilateral in which both pairs of opposite sides are parallel. An additional property of a parallelogram is that both pairs of opposite sides are congruent. Note: Similar arrow markings indicate that the sides are parallel. A rhombus is a parallelogram with four congruent sides.