perimeter=2 times length + 2 times width. if the peremiter is 20 and the length was 4, you would do 20=2(4)+2(w) and then 20=8+2w and then subtract 8 from both sides of the = sign. 12=2w and divide both sides by 2 so 6=w. in this case, the width would be 6. hope this helped!
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Perimeter = 2 * width + 2 * length, so rearranging --> width = (Perimeter / 2) - length
Length + width = half of perimeter, so you need more information...
If you do not know the length and width of ALL sides, then as far as I know it isn't possible to find the perimeter unless you measure each side and then find it.
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
It isn't clear how you would define the "perimeter" for a 3D figure. The base is the product of length x width.