An acre is a measure of area, so the 'feet' in an acre must be square feet, another measure of area.
An acre can be any shape you can imagine, but always contains 43,560 square feet. There are 640 acres in a square mile, by the way.
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Assuming that "squar" was meant to be square and "acer" was meant to be acre, the answer is 43560 sq feet.
1 acre = 43,560 square feet
1 acre = 43,560 square feet5 acres = 5 x 43,560 = 217,800 square feet
1 acre = 43,560 square feet. That's true wherever the acre is used as a unit of area.
It depends on the species. Most maples grow to around 40 feet but other acers are shrubs and are less then 30 feet tall.