Evaluate
20\sqrt{157}\approx 250.599281723
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10\sqrt{628}
Multiply 2 and 314 to get 628.
10\times 2\sqrt{157}
Factor 628=2^{2}\times 157. Rewrite the square root of the product \sqrt{2^{2}\times 157} as the product of square roots \sqrt{2^{2}}\sqrt{157}. Take the square root of 2^{2}.
20\sqrt{157}
Multiply 10 and 2 to get 20.
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