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Suppose the length of the square is x . Then it's perimeter would be equal to 4x .
Then the perimeter of the triangle would be 3( x+4)
Now as they are equal
4x = 3(x+4)
4x= 3x+12
X= 12
Therefore perimeter of the square is 4x = 4× 12= 48

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Let the length of the side of square be a inches and Length of equilateral triangle be x inches A/q x = 4+ a and , 3x = 4a ⇒3(4 +a) = 4a ⇒a = 12 so perimeter of square = 4× 12 = 48 inches