Assuming 13x19 is feet ...
247 square feet is 13 feet times 19 feet
19 x 3 = 57
19 x 10 = 190
57 + 190 = 247
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1 square foot is 0.09290304 square meters.
1 square foot is 0.0929 square meters.
There are 4 times 4 = 16 square feet
13.93 square meters.
0.107639104 square foot