240 square feet. Multiply the length by the width. The result is the area in square feet.
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The 12 x 20 foot room has an area of 240 square feet, and the 15 x 15 foot room has an area of 225 square feet. That's 465 square feet of carpet. But hold the phone. Carpet is generally sold by the square yard, and a square yard is 9 square feet (as 3 feet x 3 feet is 9 square feet). The 465 square feet of floor is 51.666... or 52 square yards of carpet. It might be necessary to buy some "extra" area depending on the width of the "stock" roll of carpet from which the desired pattern/color of carpet is going to be cut.
20 square yards
120 square feet
A square foot is a common American unit of measurement. A square foot is equal to 144 square inches.
If the dimensions are in feet then 24 times 60 = 1440 square feet