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Perimeter of equilateral triangle = 3a
Where a = side.
In terms of perimeter (P), side (a) = P/3

Area of Equilateral Triangle:

        a²  \sqrt{3}
A = ---------             where a = side = P/3

Substitute a with P/3, then the function A (Area) in terms with P (perimeter) as the independent variable:

        (P/3)² ( \sqrt{3} )
A = --------------------

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