A floorboard refers to the floor of an automobile or motor vehicle. But this is only applicable to North America. Floorboard refers to a long plank of a building's wooden floor.
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Indeterminate. A tall obect can be narrow (eg a flagpole), or a short object can be wide (a floorboard).
Convert everything to meters - i.e., 20 cm. = 0.2 meters. Do the multiplication to get the area (a) of each floorboard, (b) of the entire room, then compare (divide).