Divide the room into two rectangles. Then calculate the area of each rectangle as length x width.
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You multiply the length by the width. A = L x W
The square footage of a space is equal to L x W, with L=length, and W=width. You have 3 feet x 3 feet. 3'=L and 3'=W. So LxW= 3'x3' which is 9 square feet. It is in square feet because it is an area and not a distance. (9ft2)
For carpentry: an "L" shape For school: a triangle
' L ' = length of the room ' W ' = width of the room ' H ' = height of the ceiling Floor = ( L W ) square feet Ceiling = ( L W ) square feet 2 walls = ( L H ) square feet, each other 2 walls = ( W H ) square feet, each
The answer depends on the shape of the room. If it is rectangular, then it is the product of its length and width - both measured in feet. For any variation - for example, bay windows, alcoves, L-shaped rooms, the determination is less simple.