They came from geometry.
If you have a square whose sides are 1 unit long then its diagonal is sqrt(2) units long.
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square inches do not have square roots only number have square roots.
The square roots of all non-negative numbers smaller than 14.
Perfect square roots are square roots that have a whole number that can go into it perfectly. Nonperfect square roots are square roots that have decimal numbers going into it. Example: Perfect Square Root: 144- Square Root: 12 Nonperfect Square Root: 24- Square Root: About 4.89
You call them principal square roots.
The square roots of 64 are +8 and -8.