Posted by Kristie on Monday, March 23, 2009 at 10:33am.
Define a parallelogram

Math  Reiny, Monday, March 23, 2009 at 10:38am
A quadrilateral with its opposite sides parallel.

Math  PsyDAG, Monday, March 23, 2009 at 10:38am
Four sided figure, with opposite sides parallel, but it does not have right angles.
I hope this helps. Thanks for asking.