It depends on the shape, but I'm assuming you mean a square or rectangle. If it is not this shape, edit the question.
In this equation L=Length W=Width
So, to get the perimeter, you would use this equation: 2L+2W= Perimeter
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Assuming you mean a rectangle: use the formula:p = 2(l+w) (i.e., perimeter equals twice length plus width). In this formula, replace p with the known perimeter, and l with the given length, then solve for width.
Perimeter = 2 x (length+width). You add the length to the width and multiply the sum by two.
If you add the length and width together, it will always be half of the perimeter. In terms of an equation, it would look like so: Perimeter = (2 x Length) + (2 x Width)
This is a simple description of finding the perimeter of a square or rectangle. It has 2 values to be added for length, and 2 to be added for width, the total sum equals the perimeter. If you add length and width and then multiply by 2 you can most likely arrive at the proper answer faster than adding the 4 values.
you multiply 2 times the width and 2 times the length ad then add them together. the equation would be 2l+2w=perimeter