It is: 5 times 3 = 15 square feet
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A square yard is 3ft by 3ft
3ft x 5ft x 6ft =90
5x3x1 = 15ft3.
The square root (5 ft x 5 ft) = 5 ft.
Depends on if your talking about a 'square yard' or a 'cubic yard'. A 'square yard' has 9 square feet (3ft x 3ft). A 'cubic yard' has 27 square feet (3ft x 3ft x 3ft)