13.87
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Perimeter of square: 19+19+19+19 = 76 cm
The area of the square is (19" x 19") = 361 square inches = 2.507 square feet (rounded)= 0.27855 square yard (rounded)
Square root of 19 is 4.36
19 square yards = ~15.9 square meters.
19 square yards is 171 square feet.