You can't because there's no one answer. There are an infinite number of different
shapes with different dimensions that all have the same area of 20 acres.
-- If the field is a circle, then it's 1,053.2 feet across, and the perimeter is 3,308.7 feet.
That's the shortest perimeter it can have.
-- If it's square, then each side of the square is 933.4 feet, and the perimeter is 3,733.5 feet.
That's the shortest perimeter it can have if the sides are straight.
-- If it's a rectangle, then the perimeter can be anything more than 3,733 feet.
Here are a few examples. They're all 20 acres:
121 x 7200 . . . . . perimeter = 14,642-ft
242 x 3600 . . . . . perimeter = 7,684-ft
300 x 2904 . . . . . perimeter = 6,408-ft
363 x 2400 . . . . . perimeter = 5,526-ft
484 x 1800 . . . . . perimeter = 4,568-ft
600 x 1452 . . . . . perimeter = 4,104-ft
726 x 1200 . . . . . perimeter = 3,852-ft
800 x 1089 . . . . . perimeter = 3,778-ft
900 x 968 . . . . . . perimeter = 3,736-ft
20 acres is 871,200 square feet.
43,560 square feet per acre: 20 (acres) x 43,560 = 871,200 square feet
A square with an area of 20 acres has a perimeter of about 3,733.5 feet.
871,200 square feet.
A 20-acre square lot has a perimeter of 3,733.52 feet.
20 acres=871207 feet
20 acres is 871,200 square feet.
20 acres is 871,200 square feet.
Answer: 20 acres = 871,200 ft²
20 acres comprises 871,200 square feet.
43,560 square feet per acre: 20 (acres) x 43,560 = 871,200 square feet
In terms of square footage, 20 acres = 871,200 square feet.
A square with an area of 20 acres has a perimeter of about 3,733.5 feet.
To find the perimeter of a rectangle that covers 20 acres, first convert acres to square feet: 1 acre equals 43,560 square feet, so 20 acres equals 870,400 square feet. If the dimensions of the rectangle are not specified, the perimeter can vary. However, a common example would be a rectangle measuring 1,000 feet by 870.4 feet, which gives a perimeter of 3,740.8 feet. The exact perimeter depends on the specific dimensions of the rectangle.
871,200 square feet
The area described in the question is undefined; "20 acres" is an area itself, not a length.
2o acres is 871,200 square feet.