10 feet
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The height of a normal room is around 2.5 metres or 0.0025 kilometres.
It's just a little less than one standard sheet of board. If you take it as going upto the ceiling in a regular 8 ft.high room, then it's a section just under 4 ft. wide and ceiling height.
120 square feet on the floor, and another 120 square feet on the ceiling. We can also calculate the square feet on the walls if we know the height of the ceiling.
The area of the floor is 48 square feet, and the area of the ceiling is the same. In order to calculate the area of the walls, we have to know the height of the ceiling above the floor.
-- 190 square feet on the floor-- 190 square feet on the ceiling-- (10 x height of the room) on each of two walls-- (19 x height of the room) on each of the other two wallsTotal = [390 + (58 x height of the room)] square feet(not counting flat surfaces on any furniture or other objects in the room)