90 ft2. An area of a rectangle is h * w.
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Area of a room is its length times width.
The area of the room is 7.6m x 6.2m = 47.12m2
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.
If the area of the square room is 16 m2, then each side must be 4 m. This would give a perimeter of 4 * 4 m or 16 m.