What is the shape, a rectangle, square, or circle. If it is a rectangle, you need at least the value of length or width. If it is a square then the perimeter is
4 x (square root of 850) = 4 x 29.15 = 116.6 feet
If it is a circle, then (pi x r x r) = 850
That is 3.1415 x r x r = 850
r squared is 850/3.1415 = 270.57
Hence r is 16.45
Now the perimeter (or circumference) is pi x 2 x r = 3.1415 x 2 x 16.45 = 103.35 ft
So it is important to know the shape of the area.
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A perimeter is a measure of length and so it cannot have sq feet as units. There are precisely 5227 feet in a perimeter of 5227 feet!
Well if what you are asking is whether you would use perimeter or area to measure a set amount of wallpaper the answer is area; e.g. 1 sq. ft. of wall paper
0.3048 m = 1 ft (exactly) ⇒ 0.3048 m x 0.3048 m = 1 ft x 1 ft ⇒ 0.0929 sq m ≈ 1 sq ft ⇒ 30 sq m ≈ 30 ÷ 0.0929 sq ft ≈ 322.92 sq ft
9 sq ft = 1 sq yd so 45 sq ft = 45/9 = 5 sq yds
400 sq ft = 37.161 sq meters (rounded)