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Multiply the length of one wall by the height to give you the square footage of that one wall. Then repeat for all other walls in the room and add up the total.
The length times the height of the wall will give you the square footage of that wall. Do that for both the long and short walls, and multiply the result by two. If the room is square, just measure one wall, find the square footage, and multiply by four. Don't forget to measure the length and height of any doors and windows, and subtract the total from the area of the walls.
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
15 x 15 = 225 square feet
Find the measurements from one corner along the wall to the next corner and then repeat with the wall next to it. Once you've found the measurements, multiply them together to find the square footage.