It depends on the measurements of the walls or how long they are.
If the room was square, and each wall measured 2metres, then you multiply the measurements of two sides together to find the area - 2x2=4m2.
If it was a rectangular room measuring 2m on two sides and 4 on two sides, multiply 2x4 which equals 8m2.
Remember, the formula for working out area or a square or rectangle is length x width.
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The area of the floor is 20 square meters. The area of the ceiling is also 20 square meters. Two of the walls have areas of 15 square meters each. The other two walls have areas of 12 square meters each. Total area in the room = 94 square meters, minus the area of the doors and walls.
I take it you mean the area of the floor is 20 sq metres? In which case the ceiling would be the same size, but you can't calculate the area of the walls without knowing their height.
(21.5) x (21.5) = 462.25 -- It has 462.25 square feet on the floor. -- It has another 462.25 square feet on the ceiling. -- It has (21.5 times the height of the room) square feet on each of the four walls.
If the room is square, then the area is the square of the length of any side.The length of any side is the square root of the area = sqrt(225) = 15.
Oh, dude, it's like super simple. The area of a room is just the space inside it, right? So, if you have a 15m² room, the area is 15 square meters. It's like, the size of the floor, man. Easy peasy.