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It depends on the figure you talk about; for example:

- If circle: the Diameter D = perimeter/(Pai)

Then the area = Pai x D2 / 4

- If square: the side length L = perimeter/4

Then the area = L2

- If rectangle: then you should know either the length of one sides of the rectangle or to know the ratio of length to width.
- If you know either the length L or the width W, then you get unknown L or W from the equation:

Perimeter = 2 x (L+W); then the area = L x W

- If you know the ration x = L/W, then L = yW

perimeter = 2 (L + W) = 2 (yW +W) = 2 W (y +1)

Accordingly, you get W value and you get L value (=yW)

Then the area = L x W

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Wonderful.

Except that the question clearly stated "you only know the perimeter".

So at every point where you postulate additional information, such as

the category of the shape, or one dimension of the rectangle, you've

clearly gone beyond the situation specified in the question.

Q: How do you find the area when you only know the perimeter?

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In general you cannot find the perimeter of any shape if only the area is given.

There is no possible way to. You can only add up all the sides to get the perimeter.---It is not impossible. You can get the perimeter from area very easily.First, you find the square root of the area, which will be the length of each side (assuming it is a square).Then, once you've found the length of each side, you multiply it by 4, and you should have the perimeter. (:

You only need to know the length of one side. Knowing the side length (s) you can find the area (multiply s by s) and perimeter (multiply s by 4)

There is no perimeter of a circle. Only flat shapes have perimeters. You can however, find the circumference, surface area, and volume.

Square root the area and then times the answer by 4

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You can't only using the perimeter. You have to know length and width.

Only if you also know the shape and proportions. An equilateral triangle, for example.

In general you cannot find the perimeter of any shape if only the area is given.

There is no possible way to. You can only add up all the sides to get the perimeter.---It is not impossible. You can get the perimeter from area very easily.First, you find the square root of the area, which will be the length of each side (assuming it is a square).Then, once you've found the length of each side, you multiply it by 4, and you should have the perimeter. (:

Area times pie 3.14

You only need to know the length of one side. Knowing the side length (s) you can find the area (multiply s by s) and perimeter (multiply s by 4)

area is length times width

To get the perimeter, you need to add all three sides. I assume you can get the third side by inserting the numbers you know into Heron's formula.

There is no perimeter of a circle. Only flat shapes have perimeters. You can however, find the circumference, surface area, and volume.

Square root the area and then times the answer by 4

It not possible you nit witt that is not true length x width = area If you know length and area, solve width width = area / length then 2 x length + 2 x width = perimeter

let the length be 'x' and the breadth be 'y' then area = xy and perimeter = 2x+2y Solve the simultaneous linear equations by given area and perimeter. Regards, A Pakistani!