A rhombus is a parallelogram whose all sides are equal. The diagonals of a rhombus bisect each other at right angles.
Area of a rhombus = \(\frac12\) x product of diagonals = \(\frac12\)d1d2
Each side of the rhombus = \(\frac12\) \(\sqrt{d^2_1+d^2_1}\)
Perimeter = 4 × side = 2 x \(\sqrt{d^2_1+d^2_1}\)
Area of rhombus = side × height