Explanation:

- The area of the square is calculated by squaring its side: \(4 \, \text{cm} \times 4 \, \text{cm} = 16 \, \text{cm}^2\).

- The area of the rectangle is three times the area of the square: \(3 \times 16 \, \text{cm}^2 = 48 \, \text{cm}^2\).

- The rectangle's breadth is the same as the side of the square, which is \(4 \, \text{cm}\).

- To find the length of the rectangle, use the formula: area = length × breadth.

- So, \(48 \, \text{cm}^2 = \text{length} \times 4 \, \text{cm}\).

- Solving for length: length = \(48 \, \text{cm}^2 / 4 \, \text{cm} = 12 \, \text{cm}\).

- Correct Answer: Option:3, 12