A rhombus is a parallelogram in which all four sides are equal and all four angles may not be equal.

1. In Rhombus, opposite angles are equal
2. In Rhombus, the diagonals bisect each other perpendicularly (perpendicular bisectors)
3. If diagonals are \(p\) and \(q\), and side is a then  
4. \({p^2} + {q^2} = {\rm{ }}4{a^2}\)
5. Area of the rhombus =\(\frac{1}{2}pq\), where \(p\) and \(q\) are the diagonals. Area can also be calculated as 
   base \(\times\) height = \(AB.h\)