231 square feet.
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11 ft * 11 ft = 121 ft2 ======
(12-ft x 21-ft) / (9 square feet per square yard) = 28 square yards
165 square feet
No. 15-ft x 20-ft = 300 square feet. The 34 square feet you have only covers about 11% of it.
16 in x 1 ft = 16 in * 12 in = 192 square inches or 16 in x 1 ft = 11/3 ft x 1 ft = 11/3 square feet