You do not because there is no equivalence.
A foot is a measure of length or distance in 1-dimensional space while a square foot is a measure of area in 2-dimensional space. The two measure different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid.
1 sq ft * 6 inches = 1 sq ft * 0.5 ft = 0.5 cubic feet.1 sq ft * 6 inches = 1 sq ft * 0.5 ft = 0.5 cubic feet.1 sq ft * 6 inches = 1 sq ft * 0.5 ft = 0.5 cubic feet.1 sq ft * 6 inches = 1 sq ft * 0.5 ft = 0.5 cubic feet.
20 ft * 12.6 ft = 252 sq ft = 23.41 sq metres
=100 sq ft * 2/12 ft = 16.66... recurring cubic feet.=100 sq ft * 2/12 ft = 16.66... recurring cubic feet.=100 sq ft * 2/12 ft = 16.66... recurring cubic feet.=100 sq ft * 2/12 ft = 16.66... recurring cubic feet.
125 ft x 60 ft = 125*60 = 7500 sq feet.125 ft x 60 ft = 125*60 = 7500 sq feet.125 ft x 60 ft = 125*60 = 7500 sq feet.125 ft x 60 ft = 125*60 = 7500 sq feet.
105,600 sq feet.
12 ft * 20 ft = 240 sq ft 5 ft * 5 ft = 25 sq ft So 12 ft * 20 ft minus 5 ft * 5 ft = 240 sq ft - 25 sq ft = 215 sq ft
1 sq ft * 6 inches = 1 sq ft * 0.5 ft = 0.5 cubic feet.1 sq ft * 6 inches = 1 sq ft * 0.5 ft = 0.5 cubic feet.1 sq ft * 6 inches = 1 sq ft * 0.5 ft = 0.5 cubic feet.1 sq ft * 6 inches = 1 sq ft * 0.5 ft = 0.5 cubic feet.
10 ft x 29 ft = 290 sq ft
Square feet is how you calculate area. Feet is how you measure a line. To calculate area go: lenth(ft) x width(ft)=area(sq. ft)
20 ft * 12.6 ft = 252 sq ft = 23.41 sq metres
12 ft * 28 ft = 12*28 sq ft = 336 sq ft
40 ft × 80 ft = 3200 sq ft
=100 sq ft * 2/12 ft = 16.66... recurring cubic feet.=100 sq ft * 2/12 ft = 16.66... recurring cubic feet.=100 sq ft * 2/12 ft = 16.66... recurring cubic feet.=100 sq ft * 2/12 ft = 16.66... recurring cubic feet.
125 ft x 60 ft = 125*60 = 7500 sq feet.125 ft x 60 ft = 125*60 = 7500 sq feet.125 ft x 60 ft = 125*60 = 7500 sq feet.125 ft x 60 ft = 125*60 = 7500 sq feet.
17 feet X 20 feet = 340 sq ft 340 sq ft X 0.0929 sq meters/sq ft = 32 square meters
105,600 sq feet.
Area = 48 ft * 10 ft = 48*10 sq ft = 480 sq ft.