Description
Explanation & Answer
Consider this:
1 mi ^2 / 640 acres = 0.00156 mi ^2 / acre
Now that we have a number with a unit per acre we can start to work towards getting a final answer in feet. Remember when working with a unit area to square a conversion factor that is given for a measure of length.
0.00156 mi ^2 / acre * ( 5280 ft / 1 mi ) ^ 2 = 43560 ft ^2 / acre
Now that we know the number of square feet in an acre, taking the square root of the answer above will give us the length of a single side of the square.
SQRT(43560 ft ^2 ) = 209 ft
So your answer should be (B)
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