Firstly, what is the shape of the area?
If it is a circle, then using pi x r squared divide the area by 3.142 and take the square root of the answer. Double that and multiply by 3.142 and you have the length of the circle perimeter.
If it's a square (i.e. all sides are equal) take the square root of the area. This gives you the length of one of the sides. Multiply by 4 and you have the perimeter.
For other shapes it gets more difficult. And for some it's nearly impossible. For example you might have an oblong that has an area of 10 square inches. That could be an oblong of 5" x2". It could also be 10,000" x 0.001".
The more closely the area resembles a circle the smaller is the perimeter compared with the area.
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To find the perimeter you add and to find the area we multiply.
Perimeter = 2*Area/Apothem.
you divide the area by four and now you can find the perimeter
Perimeter = 4*Side so that Side = Perimeter/4 Area of a rhombus = Side * Altitude so Altitude = Area/Side = Area/(Perimeter/4) = 4*Area/Perimeter
In general you cannot find the perimeter of any shape if only the area is given.