which 3 square numbers add to make another square number
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4 Answers

2^2+3^2+6^2=7^2

4   +   9+  36=49

That's just one example.
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12+19=

by
The following triples will work.

1, 2, 2          2, 3, 6          1, 4, 8          4, 4, 7         2, 6, 9       6, 6, 7

You can also multpliy them by any number to get another triple that will work (e.g. 2, 4, 4 and 3, 6, 6 and 4, 8, 8 etc.)
by
2 squared + 3 squared +6 squared = 49 whose square root = 7
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