1 acre = 4840 sq yd = 9 x 4840 = 43560 sq ft.
If 1 acre was the area of a square then it would have sides measuring 208.71 ft
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There are 43,560 square feet in an acre. This would be a square 208 feet and 8.5 inches on each side. Going in the opposite direction, there are about 640 acres in a square with sides one mile long.
The answer will depend on whether the 6 feet refers to the radius or diameter of the circle and which length is being measured in lineal feet.
An acre is 43,560 square feet. An easy way to remember this is that an acre is 66 feet wide by 660 feet long.
A circle with a diameter of 9 feet has a perimeter of 28.3 feet.
None. A foot (or feet) is a length. An acre is an area.