You need one wall length to divide the area by...
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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)
To determine the length of a wall in a classroom, you would need to physically measure it using a tape measure or a measuring wheel. Start at one end of the wall and measure all the way to the other end in a straight line. Make sure to account for any obstacles or corners that may affect the measurement. Once you have the measurement in feet or meters, you will have the length of the wall in your classroom.
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?
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.