Evaluate
2\sqrt{1785}\approx 84.498520697
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\sqrt{7140}
Multiply 340 and 21 to get 7140.
2\sqrt{1785}
Factor 7140=2^{2}\times 1785. Rewrite the square root of the product \sqrt{2^{2}\times 1785} as the product of square roots \sqrt{2^{2}}\sqrt{1785}. Take the square root of 2^{2}.
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