1 sq = 1. 2 sq = 4. 3 sq = 9. 4sq = 16. 5sq = 25. 6sq = 36. 7sq = 49. 8sq = 64. 9sq = 81. 10 sq = 100. 11 sq = 121. 12 sq = 144.
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The two square numbers that add up to 225 are 144+81 = 225
144 has only one square, and that is 20,736.
They are called perfect squares.
They are: 9 and 16
The subsets of all the square roots of 144 are {+12} and {-12}. The single set that includes all the square roots of 144 is {+12, -12}. That's all there are. There are no more.