Theres no way we can tell you that without any dimensions of the room. Try again. Unless the answer is 0, because the floor is touching the door.
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If the floor area is 313 square meters, then the floor area is 313 square meters.
187 metres squared
You need3.11 square meters/area of each tile .
The area of the ceiling is 30 square meters. The area of the floor is also 30 square meters. We could determine the area of the walls if we knew the distance from the ceiling down to the floor.
The typical door in a classroom is about 2 meters, or two yards and 1/3.