You can't. Feet are measure of length and an Acre is a measure of area - thus the two can not be equated. You need to know how many Square feet are in an Acre - because square feet are a measure of area too. 1 acre = 43560 square feet. See the conversion utility in the links I will place below.
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1 acre = 43,560 square feet
Here is a good site to figure it out 80 acres is 3,484,800 square feet 43560.4 sq ft = 1 Acre
1 acre = 43,560 square feet
1 acre = 43,560 square feet
1/4 acre = 10,890 square feet.