we know that
A square plot of land of dimensions 1 mile x 1 mile is 640 acres
5,280 ft is equal to 1 mile
so
5,280 *5,280 =27,878,400 [tex]ft^{2}[/tex]-------> is equal to 640 acres
by proportion
[tex]\frac{27,878,400}{640} \frac{ft^{2}}{acres} = \frac{x}{1} \frac{ft^{2}}{acres} \\\\640*x=27,878,400 \\\\x= \frac{27,878,400}{640}\\\\ x=43,560\ ft^{2}[/tex]
Find the edge of the square plot
[tex]=\sqrt{43,560} \\= 208.71\ ft[/tex]
therefore
the answer is
[tex]208.71\ ft[/tex]
