one cubic foot contains 9 square feet
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That is totally incorrect. A square foot is a measure of area - a 2-dimensional concept. A one foot cube is a 3-dimensional object. The two are measures of different things and it makes no sense to try to relate one to the other.
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225 square feet
1,000 square feet.
108 square feet
None. Square feet is a measure of area. A foot or feet measure length.
360 square feet.