Assuming both the length and width are the same, the answer would be 8.944...
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80 square inches
A square with a side length of 20 cm (80/4) has an area of 400 cm2
You don't have enough information. If the area in question is a circle, the perimeter (circumfrence) is about 31.7 inches. If it is a square, the perimeter is about 35.8 inches. and if the area is a very long and thin 80 inches by one inch, the perimeter is 162 inches. You need to know the shape; even though many shapes might have an area equal to 80 square inches, the perimeter will vary depending on shape.
A circle with a radius of 80 inches has an area of 139.6 square feet A circle with a circumference of 40.5 feet has an area of 130.5 square feet
If the radius of a circle is 80 inches, then the area of the circle is 139.6263 square feet. (rounded)