If the diagonals of a rhombus are in the ratio 5 : 4, then what is the ratio of the area of the rhombus to the product of the diagonals?

Correct option is C

As we know in the question we have been asked about ,
Area of rhombus = 1/2× d1× d2 ...(d1 and d2 are the diagonals)
=> Area of rhombus/(d1 x d2) = 1/2
Area of rhombus : (d1 x d2) = 1:2