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The square root of 166 is 12.88409873
That is in its simplest form. You can't simplify sqrt(166) any more then it is. The decimal approximation can be found by (166)^1/2
No because it is a ratio of two integers (that's what "rational" means) 166/100
166
49.5% of 166= 49.5% * 166= 0.495 * 166= 82.17