Answer:
Y=4cm
Explanation:
We can use the relationship between the side length and area of a square to solve for Y. Let's call the area of the small square "A" and the area of the large square "B". From the problem statement, we know:
A = 1/9 * B
Since the area of a square is equal to the side length squared, we can substitute this relationship into the equation above:
Y^2 = 1/9 * 12^2
Solving for Y:
Y^2 = 1/9 * 144
Y^2 = 16
Y = sqrt(16)
Y = 4
So, the side length of the small square is 4 cm.