Rhombus

In geometry, a rhombus (also known as a rhomb) is a parallelogram in which all of the sides are of equal length. More colloquially it may be described as a diamond or lozenge shape.

In any rhombus, opposite sides will be parallel. Thus, the rhombus is a special case of the parallelogram. One suggestive analogy is that the rhombus is to the parallelogram as the square is to the rectangle. If all the angles of a rhombus are right angles, it is then a rectangle and a square.

The area of any rhombus is one half the product of the lengths of its diagonals.