Answer:
Perimeter of the square\[=\text{4}\times \text{side}\] \[\Rightarrow \] \[\text{320 = 4 }\!\!\times\!\!\text{ side = }\frac{\text{320}}{\text{4}}\] \[\Rightarrow \] \[\text{= 80 m}\] Area of the square \[\text{= side }\!\!\times\!\!\text{ side}\] \[=80\times 80=640\text{0 }{{\text{m}}^{\text{2}}}\].
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