Very confused Geometry: Converting from One Unit of Measurement to Another

Question

One acre is 43,560 square feet. If a square piece of land is 3 acres, then what are the length and width of this piece of land in feet? (Remember that the length and width of a square are the same.) Explain your reasoning.

Answer 1

s = length of any side of the square piece of land

A = area

A = 3 acres

1 acre = 43,560 ft²

3 acres = 3*43,560 = 130,680 ft²

s² = A

s² = 130,680 ft²

√s² = √130,680 ft²

s = 361.497 ft

Answer 2

If one acre is 43,560 square feet, the 3 acres is 3 times that (130,680 square feet)

If the length and width are the same and x is the length, then x = square root (130,680) = 361.5 feet