As you state circumference, it may be assumed the room is circular/round. If so the answer is 3.141 multiplied by the diameter.
If the room is square/oblong, measure each wall with a tape and add the four measurements together
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You need one wall length to divide the area by...
Calculate the area of the room. Calculate the area of the window (or whatever opening) Room Area*100/Window Area
The same way you calculate the surface area of any other rectangle: Multiply the length of the wall by its height.
thicknesss of wall multiply by height of wall multiply by length of wall and multiply by density of wall (19000)
measure each wall length in feet. for example a square has 4 sides and say each wall measures 4 ft. Multiplylength by width and that would be 16 sq feet(hopefully nothing that small). What are your mesurements?