Area of a room is its length times width.
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You cannot calculate the length and width of a room on its area alone. You could compute the square root of the area on the assumption that the room has a square shape, but you'd generally need the ratio of length over width.
You normally measure the linear dimensions and then calculate the area (square footage).If you have a rectangular room, you measure its length and width in feet and then multiply the two numbers to get the area of the room in square feet. If the room is not rectangular (eg with a bay, an alcove or an L-shaped room) you will need to divide it up into simpler shapes, calculate the area of each shape and add the areas together.
To calculate the square footage of a room, you multiply the length by the width. In this case, the room is 10 feet by 15 feet, so the square footage would be 10 x 15 = 150 square feet.
The area of the floor is (15 x 22) = 330 square feet. The area of the ceiling is also (15 x 22) = 330 square feet. In order to calculate the area of the walls, we'd have to know the height of the ceiling.
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