It is a hypercube in 4-dimensional space with an area of 3200 quartic feet.
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It is: 40*80 = 3200 square feet
The area is 80 square feet.
40*40 = 1600 square feet
1 acre = 43560 square feet⇒ 80 acres = 80 x 43560 square feet= 3484800 square feet
80 feet x 8 feet = 640 square feet.