The answer depends on 80 what: 80 millimetres, 80 centimetres, 80 inches, metres, miles?
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There are 80*80 = 6400 sq feet.
80 feet x 8 feet = 640 square feet.
80 miles = 422,400 feet.
The area is 80 square feet.
1 acre = 43560 square feet⇒ 80 acres = 80 x 43560 square feet= 3484800 square feet