Square feet can't be converted to feet. Square feet measure area, while feet measure length.
1500 sq ft.
36000 Btu
10 ft x 29 ft = 290 sq ft
40 ft × 80 ft = 3200 sq ft
12 ft * 28 ft = 12*28 sq ft = 336 sq ft
27,878,400 sq ft.
1280 sq ft
105,600 sq feet.
~127.4625 Sq. Ft.
36 sq ft
Area = 48 ft * 10 ft = 48*10 sq ft = 480 sq ft.
assuming those numbers are in feet: 10 ft * 20 ft = 200 sq. ft.