Answer:
[tex] \huge{ \fbox{ \sf{12 \: miles}}}[/tex]
Step-by-step explanation:
Given,
Area of a square plot = 9 miles
First, finding the length of the land
[tex] \boxed{ \sf{Area \: of \: a \: square \: = \: {length}^{2} }}[/tex]
[tex] \mapsto{ \sf{9 = {length}^{2} }}[/tex]
[tex] \mapsto{ \sf{ {length}^{2} = 9}}[/tex]
[tex] \mapsto{ \sf{ \sqrt{ {(length)}^{2} }} = \sqrt{9} } [/tex]
[tex] \mapsto{ \sf{length = 3 \: miles}}[/tex]
Now , finding the perimeter of the land :
[tex] \boxed{ \sf{perimeter \: of \: a \: square = 4 \: * length}}[/tex]
[tex] \mapsto{ \sf{perimeter \: = \: 4 \: * \: 3}}[/tex]
[tex] \mapsto{ \sf{perimeter \: = 12 \: miles}}[/tex]
The perimeter of the land = 12 miles
Hope I helped!
Best regards! :D
~[tex] \text{TheAnimeGirl}[/tex]