A Quadrilateral with both pairs of opposite sides Parallel and all sides the same length, i.e., an equilateral
Parallelogram. The word Rhomb is sometimes used instead of rhombus, and a rhombus is sometimes also called a
diamond. The Diagonals and of a rhombus are perpendicular and satisfy

The Area of a rhombus is given by

A rhombus whose Acute Angles are 45° is called a Lozenge.

**References**

Beyer, W. H. (Ed.) *CRC Standard Mathematical Tables, 28th ed.* Boca Raton, FL: CRC Press,
p. 123, 1987.

© 1996-9

1999-05-25