The units are incompatible. Cubic measurements are for volume, square measurements are for area.
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A square foot does not contain cubic inches because it is a flat square; a cubic foot contains cubic inches in which case L x W x H gives you 1,728 cubic inches in a cubic foot. 12 x 12 x 12 = 1,728
1728 cubic inches.
1728 cubic inches.
First, a square is a two-dimensional form, a cube is three-dimensional, and feet is a lineal measurement, ie., one-dimension, so no number of feet will ever equal a square or a cube. An inch is 1/12 of a foot. A square inch is 1/144 of a square foot. A cubic inch is 1/1728 of a cubic foot.
27 cubic feet = 1 cubic yard4 inches = 1/3 foot(81 square feet) x (1/3 foot) = 27 cubic feet = 1 cubic yard