I believe a square foot is a square that is three inches on each side.
144 square inches
An acre is 43560 square ft, or if it is in the shape of a square, 208.71 ft on each side.
10 ft X 10 ft = 1square
If square room, then it 13.86 ft x 13.86 ft
729 ft.
40 ft
depends on how big is the square ft is
A square of half acre in area is approx. 147.6 ft x 147.6 ft.
A square foot is a square with 12 inches on each side.
700 Square Ft.
27,878,400 sq ft
It is 696.8 square metres.