JJAP+parallelogram

Level 0: The parallelogram is a quadrilateral with two pairs of parallel sides.
"Parallelogram." //Parallelogram//. Web. 8 Dec 2009. .



====This is the most important property because if the two pairs of sides are parallel (also assuming that the sides connect by points) then the opposite sides become congruent along with the opposite angles. This property gave the quadrilateral the name, parallelogram.====