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?
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Calculate the area of the room. Calculate the area of the window (or whatever opening) Room Area*100/Window Area
surface area divided by volume
To calculate the surface area of a shape find the area of each side, and then, add all of the areas together. The sum of the areas is the surface area.
Surface area: when you want to paper a room or pain it. Volume: When you want to know how much stuff you can cram into the boot of your car, or in a fridge, suitcase.
The surface area of a sphere = 4*pi*radius2