What are facts about a rhombus?

A rhombus is a polygon.

A rhombus is a 4 sided shape and an 'equilateral quadrilateral' (all sides are the same length).

Opposite angles are equal in a rhombus.

A rhombus can tessellate.

A rhombus has two lines of symmetry, joining its opposite corners.

A rhombus also has rotational symmetry. A kite is a rhombus, and has rotational symmetry of both 180 degrees as well as 360 degrees,

A rhombus is not a regular polygon as all angles have to be congruent for it to be classed as regular.