Question 666629
6^2 + 9^2 =?  12^2
36 + 81 =? 144  NO.

7^2 + 10^2 =? 12^2
49 + 100 =? 144 NO.

16^2 + 18^2 =? 25^2

256 + 324 =? 625  NO.

27^2 + 36^2 =? 45^2
729 + 1296 =?  2025 Yes.

(27,36,45) is a Pythagorean Triple.