4.5 inches by 36 inches is 1.125 sq ft
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By unit of length and distance and conversion ,we can say that 1 ft =12 in 3 ft =36 in 36 + 9 =45 inches
45 inches.
36" by 4" = 3 ft by (1/3) ft = 1 sq ft.
31.25 ft or 31 ft and 3 inches
3 ft = 36 inches