There is no "the" formula. The answer depends on what you are looking for: perimeter, length of side, diagonal, area, angles; and what information you have.
For example, given the length of a side (s) and an angle (A), Area = s^2*sin(A).
The question needs to be more precise in terms of what is required.
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There is no specific "formula." If you want the area of a rhombus, that is just A = bh/2 or (1/2)xy where x and y are the lengths of the diagonals.
The answer depends on what information is given to you.
The answer depends on the information given.Area = s^2*sin(x) where s is the length of a side and x is the measure of any of the interior angles of the rhombus.
It is a plane figure, bounded by four straight sides, all of the same length. All other properties of a rhombus follow from this definition. If you had some other "formula" in mind perhaps you could have said so in the question.
A rhombus. A rhombus. A rhombus. A rhombus.