The area of the square A will be:

The correct answer is Option (2) → 25 cm²

One side of square A is the hypotenuse of the right-angled triangle with legs 3 cm and 4 cm. The area of the square is the square of that side, so by Pythagoras' theorem it equals the sum of the squares of the legs.

• Hypotenuse\(^2=3^2+4^2=9+16=25\), so the side of A is 5 cm

• Area of square A \(=5^2=25\) cm²