What calculation is required to determine the length of one side of a 160-acre square lot?

To determine the length of one side of a 160-acre square lot, calculating the square root of the total square feet is the necessary approach. First, it's important to understand how many square feet are in an acre. One acre contains 43,560 square feet. Therefore, a 160-acre lot would equal 160 multiplied by 43,560 square feet.

Once the total square footage is calculated, the length of one side of the square lot can be found by taking the square root of that total square footage because, in a square, all four sides are of equal length. This mathematical process gives the length of one side of the square lot, consistent with the area calculation. Therefore, calculating the square root of the total square feet will yield the length of one side.

The other choices do not provide a valid method for finding the side length of the square lot, as they either imply unnecessary conversions or calculations that don't lead to the required length.