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You cannot.
First of all you need to assume that the figure in question is a quadrilateral and not a triangle of polygon with 5 or more sides. Even so, for a given perimeter there are infinitely many combinations of length and width.
Here is an illustration, using perimeter = 12 units
(L,W) = (3,3), (3.1,2.9), (3.01,2.99)
In general, L = any number, rational or irrational, between 3 and 6 and W = 6-L will result in the perimeter being 12.
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What is the formula to find the length of a rectangle when the perimeter and width is already given?
Length = (Perimeter - twice width) / 2
How do you find area when given perimeter and width?
If you are given the width and the perimeter, then figure out what the length is then calculate the area... hope this helps :)
Find the perimemter of a rectangle with length 15 meters and width 10 meters?
The perimeter of a rectangle is given by:P = 2l + 2w, where P is the perimeter of the rectangle, l is the length of the rectangle, and w is the width of the rectangle.P = 2(15) + 2(10) = 50 meters.
How do you find the length and width and the area is given?
If the area is already given, there should also be either width or length given. Do the area, divided by the length or the width. For example, the area divided by the width equal the length. Hope it helps.
If you know a perimeter of a square but not the length or width how do you find the area?
Divide the perimeter by 4 and then square the result to find the area of the square.
