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
See also Diamond, Lozenge, Parallelogram, Quadrilateral, Rhombic Dodecahedron, Rhombic Icosahedron, Rhombic Triacontahedron, Rhomboid, Skew Quadrilateral, Trapezium, Trapezoid
Beyer, W. H. (Ed.) CRC Standard Mathematical Tables, 28th ed. Boca Raton, FL: CRC Press,
p. 123, 1987.