Simply add the given dimension to itself 4 times to get
2 feet 4 inches
2 feet 4 inches
2 feet 4 inches
+ 2 feet 4 inches
-----------------
8 feet 16 inches
But since 12 inches = 1 ft, this means that 8 ft 12 inches = 8 ft + 1 ft + 4 inches = 9 ft 4 inches
So the perimeter of the square is 9 ft 4 inches.
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