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Measure WIDTH and HEIGHT - multiply both figures - result = Sq Ft. Isn't LENGTH an essential part of this formula? The WIDTH I refer too is also/can be called the LENGTH of a wall - easily. Actually the latter may in fact be more frequently used. In any case, the multiplication of WxH or LxH will give the right answer - wall surfaces have only 2 dimensions.
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.
You need one wall length to divide the area by...
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
They are simply non-concurrent lines. They need not be parallel. To illustrate that consider yourself in a cuboid room standing with your back to one wall. Line 1 is where the floor and wall meet behind you. Line 2 is where the left wall meets the wall facing you (the far wall). The two lines do not intersect but they are not parallel. There are many other such lines in the room.