120 inches is a linear measurement, so there are zero square feet in 120 inches. For 120 inches2, however, as there are 144 square inches in one square foot (12 inches by 12 inches), there are 120/144 square feet in 120 square inches, or .833 ft2.
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As square inches are a measure of area, you can measure any area you like in square inches. However, depending upon the size of the area: square feet may be more appropriate for the size of a room square yards may be more appropriate for a small piece of land acres may be more appropriate for a larger piece of land square miles may be more appropriate for a very large piece of land.
it is 6.25 feet (or 6 feet 3 inches).
A square yard can represent a square with dimensions of 3 feet by 3 feet. Therefore a 7 foot diameter gasket cannot be cut out of a square yard. If you meant 7 inches diameter, then you will be able to cut 25 gaskets from 3 feet by 3 feet but you may even be able to cut 26 gaskets if the square yard was a rectangle of 7 inches wide (by 185 inches long).
The question as stated makes no sense, as square feet is a measure of area and "yard", is a measurement of volume. Normally, "yard" is a measurement of length. However, concrete, soil, gravel, sand, etc., are normally sold (in the U.S.) by the "yard" which is simply short for "cubic yard." However, you may easily calculate the area that a yard of crushed rock will cover, depending on the desired depth of crushed rock. As a cubic yard is 3 feet by 3 feet by 3 feet, which is equivalent to 9 square feet by 36 inches, simply divide 36 inches by the desired depth in inches, and multiply it by 9 square feet. Thus, if you wanted a depth of 8 inches, 36 divided by 8 is 4.5. So, you can cover 4.5 square yards, or 4.5 times 9 square feet = 40.5 square feet, which would be a square area approximately 6 feet 4 inches by 6 feet 4 inches.
You may want to use a calculator. 18 in x 18 in =? square inches There are 144 square inches in a square foot. Divide the square inches in one tile by 144. That should equal about 2.25 square feet per tile. 425 divided by the square feet in one tile -- that would give you the number of tiles. It would take about 189 tiles.