A non-terminating decimal.
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Square root of 2...
Nonterminating Decimal: A decimal that continues without end.For example:The square root of 2 = 1.414213562… Therefore, the square root of 2 is a nonterminating decimal.
Yes, the square root of 7 is an irrational number. Written in decimal form, it never terminates or repeats. √7 is approximately 2.645751311064591
There is no "best" approximation. The square root is irrational and so it is a non-terminating, non-recurring decimal so adding one more digit will always make it a better approximation.
The square root of 257 is an irrational number, as it cannot be expressed as a fraction or whole number. It is a non-repeating, non-terminating decimal.