a quadrilateral with two sets of opposite sides that are parallel is called a parallelogram. parallelograms are generally named by the name of the figure plus the four vertices.

the perimeter of a parallelogram can be multiplied by two (base 1 + base 2); if "a" represents base 1, "b" represents base 2, and "c flat" represents the perimeter of the parallelogram, then the perimeter of the parallelogram c=2 (a+b)