You do not.
A [linear] foot is a measure of length or distance in 1-dimensional space while a square foot is a measure of area in 2-dimensional space. The two measure different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid without some addition information.
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There are linear feet, and square feet, but no "linear square feet".
Feet can't be converted to square feet. Feet measure length, while square feet measure area.
20 square feet.
The two are different units of measure. Linear feet is a distance BETWEEN two points. Square yards is an AREA, such as the area of a living room. Linear feet is one dimensional. Square yards is two dimensional.
To convert square yards to square feet, you need to know that 1 square yard is equal to 9 square feet. Therefore, to convert 240 square yards to square feet, you would multiply 240 by 9. This gives you a total of 2160 square feet. So, 240 square yards is equal to 2160 square feet.