Special Notes! The length of the mid-segment is the average of the lengths of the parallel sides. Trapezoid. Definition: A quadrilateral with a pair of parallel sides. Definition: A quadrilateral opposites sides parallel. Parallelogram. Special Notes! Adjacent angles are supplementary.
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Definition: A quadrilateral with two parallel sides (called bases) whose non parallel sides are congruent.
Definition: A quadrilateral with four congruent sides.
Definition: A parallelogram with one right angle.
Definition: A quadrilateral with two pairs of congruent adjacent sides.