Which set of side lengths is a Pythagorean triple?

Answer:
C. 9,40,41
Step-by-step explanation:
The last number in any answer is always the hypotenuse and that is what u will use, because according to the formula:
hypotenuse² = opposite²+adjacent² so;
41²=40²+9²
1,681 = 1600 + 81
1,681 = 1,681
so it is balanced and that means the answer is ✅