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➷  Perimeter : [tex]4\sqrt{5}[/tex] x 4 = [tex]16\sqrt{5}[/tex] mm

Area : [tex]4\sqrt{5} * 4\sqrt{5}[/tex] = 80mm^2

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Answer:

perimeter = 16√5 units

area = 80 units

Step-by-step explanation:

perimeter of square = sum of all 4 sides

= 4√5  x 4

= 16√5 units

area of square = length of side ²

= (  4√5  )²

= 4² · (√5)²

= 16 · 5

= 80