9 + 16 = 25
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The square of the second number.
80
When you subtract one number from another you get the difference.You just said it; sum.
The two square numbers that add up to 225 are 144+81 = 225
The formula for finding the nth square number is n^2. Therefore, the 3rd square number is 3^2 = 9, and the 6th square number is 6^2 = 36. To find the sum of the 3rd and 6th square numbers, you add them together: 9 + 36 = 45. So, the sum of the 3rd and 6th square numbers is 45.