Use the formula: Area = 1/2 × d1 × d2
d1 and d2 are the diagonals of the rhombus
If the side length and height are given, use: Area = base × height
Since all sides of a rhombus are equal, any side can be used as the base
If the side length and one angle are given, use: Area = a² × sin(θ)
a is the side length
θ is the included angle between two sides