A Rhombus is a four-sided polygon having all four sides of equal length and whose opposite sides are parallel.

Each rhombus has two diagonals. The biggest one is called long diagonal and the smaller one is called short diagonal. (Note that the diagonals of a rhombus are perpendicular).

The area of any rhombus is equal to one-half the product of the lengths D and d of its diagonals.

Exercise:
Find the area of the rhombus where:

The diagonal sides are consecutive even numbers. The long diagonal is 12 units long.