There are two answers to that:
1² + 13² = 1 + 169 = 170
7² + 11² = 49 + 121 = 170
The two square numbers that add up to 225 are 144+81 = 225
The two square numbers which add up to 13 are 9 (which is equal to 3 squared), and 4 (which is equal to 2 squared).
9 and 36
16 and 9
9 + 16 = 25
5300
The two square numbers that add up to 225 are 144+81 = 225
160
92
The two square numbers which add up to 13 are 9 (which is equal to 3 squared), and 4 (which is equal to 2 squared).
The answer is 340. Simply add the numbers together arithmetically as you would for the problem two plus two. To check your work, a calculator is the best option.
Square numbers.
9 and 36
16 and 9
16, 25
9 + 25
40