square 15 is 3+4 over 2 =3.5. square 15 must be between 3 and 4 and since 3 squared=9 and 4 squared =16

3^{2} =9

4^{2}=16

3.5^{2}=12.25

3.75^{2}=14.0625

3.875^{2}=15.01

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