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The perimeter of the square is given
P = 72 in

The perimeter formula of a square is P = 4 x sides

To find the value of the side, we divide by 4
72 = 4s
[tex] \frac{72}{4} = \frac{4s}{4} [/tex]
4 and 4 cancels out

18 in = side

The area formula of a square is 
A = (side)²
   = (18)²
   = 324 in²