Which of the following can be the sides of a right angled triangle?

For a right-angled triangle, the square of the largest side must equal the sum of squares of the other two (Pythagoras). Check option (4): 65² + 72² = 4225 + 5184 = 9409, and 97² = 9409. ✓ Hence 65, 72, 97 forms a right triangle. Other options: (1) 400 + 441 = 841 ≠ 961. (2) 1225 + 5929 = 7154 ≠ 7744. (3) 225 + 1024 = 1249 ≠ 3249. Only option (4) satisfies.