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.
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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.
A rhombus. A rhombus. A rhombus. A rhombus.
The are different formulae for its perimeter, area, lengths of diagonals, angle and these depend on what information is provided.