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.
Because, in this four sided figure, the opposite sides are parallel to each other.