A rhombus is a type of quadrilateral in Euclidean geometry. It is a special case of a parallelogram, whose all sides are equal and diagonals intersect each other at 90 degrees. The shape of a rhombus is in a diamond shape, and it is also called a diamond. Opposite sides of a rhombus are parallel, and the opposite angles are equal. All the sides of a rhombus are equal in length, and the diagonals bisect each other at right angles. The rhombus is also called a rhombus diamond. The plural form of a rhombus is rhombi or rhombuses.

Some of the properties of a rhombus are:

• All sides of a rhombus are equal.
• Diagonals bisect each other at 90° .
• Opposite sides are parallel in a rhombus.
• Opposite angles are equal in a rhombus.
• Adjacent angles add up to 180° .

A rhombus is a special type of parallelogram, and every rhombus is a kite. Every rhombus is simple (non-self-intersecting), and a rhombus with right angles is a square.