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 Description  
 Parallelogram:  A quadrilateral with opposite sides that are parallel.

The figure below is a parallelogram. Aside from having opposite sides that are parallel, parallelograms have several other special properties. What might you conjecture about the lengths of the opposite sides of a parallelgram? What can you conjecture about the measures of the opposite angles in a parallelogram? The consecutive angles of a parallelogram also have a special relationship. Can you tell what it is?