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It would depend on the shape that you are asking about. Also, only special shapes could express area as a function of the perimeter.

Example: a square: area = s2, where s is the length of a side. Perimeter of a square is 4*s.

So if P (for perimeter) = 4 * s, then s = P/4,

and A (for area) = s2 = (P/4)2 = P2/16

But for a rectangle that is not a square, there is no relationship between area and perimeter.

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Q: How do you find area using perimeter?
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