Answer: 16cm^2
Explanation: Area of square 1 is 25cm^2 so 1 Side will be 5cm, Perimeter of square 2 is 12 so one side will be 3. We need to use pythagorus theorem to find out the sude of square 3 so 5^2 - 3^2 = 16 and square root of 16 = 4 so the area of square 3 is 4x4 = 16cm^2