Let the side of equilateral triangle = a and the side of square = b Perimeter of triangle = 3a Perimeter of Square = 4b So 3a = 4b or b = 3a/4 Area of equilateral triangle =(3)1/2 /4 a2 Area of square = b2 Area of triangle/ Area of square = 4(3)1/2 : 9