The length is one dimension. You can measure it along one edge of the floor.
The width is another dimension. You can measure it along another edge of the floor.
The height is the third dimension. You can measure it in the corner where two walls meet.
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Length , Width and Height
Your question makes no sense.feet are a measure of length, whereascubic feet are a measure of volume.Volume has three dimensions, each of those dimensions being a length.
The answer is 324 square feet, you get this answer by multiplying 27 by 12 which is the dimensions of your room.
Often these are three linear dimensions. Normally these are the dimensions in mutually perpendicular directions, but they need not be: they can be in any three directions which are not coplanar. Depending on the context, the linear dimensions are called:Length;Breadth or width; andHeight or depth.Also, the answer may comprise measure one distance and two angles: as might be done to locate an object in astronomy.
You take a ruler or tape measure and measure the dimensions you need.