a parallegram or a rhombus.
A four sided figure with all sides the same length and opposite sides parallel.
A quadrilateral (four sided figure) with opposite sides parallel and equal length see: http://dictionary.die.net/parallelogram
There is no way to know.If two opposite sides are parallel and of equal length, then the quadrilateral is a parallelogram (rectangle, rhomboid, square, or rhombus).
parallelogram
Square
A 4 sided figure in which opposite sides are parallel.
quadrilateral
Parallelogram.
A parallelogram is a 4 sided geometric figure with opposite side parallel.
A parallelogram is a four-sided plane figure with opposite sides parallel.
A four-sided figure with two pairs of parallel sides the same length and four right angles is called a square.
A four-sided figure with opposite sides that are parallel is called a parallelogram. This category includes shapes such as rectangles, rhombuses, and squares, all of which have the property of parallel opposite sides. Parallelograms also have additional properties, such as opposite angles being equal and the diagonals bisecting each other.