The area of the room is the result of multiplying the lengths of two walls. So if your room is 400 square feet, the walls might be 20 ft. by 20 ft., 10 ft. by 40 ft., or any other combination that would multiply out to be 400.
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20 x 20 = 400 The room has 400 square feet on the floor, 400 square feet on the ceiling, and (80 x height of the room) square feet on the walls.
400 square feet, at the school I went to.
400 square ft = 37.16 square m
400 square meters is 4,305.56 square feet.
400 square feet (20 x 20 = 400)