If all four sides of this type of figure are of equal length, the figure is a rhombus.
This shape names a law for adding vectors. In a namesake illusion, diagonals of two of these figures appear to be different lengths, though they are not. Though not necessarily the same length, the diagonals of this quadrilateral bisect each other. If all four sides of this type of figure are of equal length, the figure is a rhombus. For 10 points, name this shape drawn from two intersecting sets of parallel lines.
This shape names a law for adding vectors. In a namesake illusion, diagonals of two of these figures appear to be different lengths, though they are not.
{parallelogram} [do not accept or {prompt} on more specific answers such as "rhombus," "square," or "rectangle;" do not accept or prompt on less specific answers such as "quadrilateral"]