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Anonymous
144 of them are.
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141 ft2 9 in2
1 cm2 = 0.155 in2
1 ft2 = 144 in2 (12 inches x 12 inches), so divide by 144: (360 in2)/(144 in2/ft2) = 2.5 ft2
18 in2 = ~0.0139 yd2
2790 in2 - which is 19.375 ft2