None. A foot (or feet) is a length. An acre is an area.
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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.
An acre is a constant unit of measurement - an acre of anything is equal to an acre of anything else.
Assuming the question is about acre and square feet, 1 acre = 43560 square feet.
Josh
1 acre = 43,560 sq. ft.