Evaluate
20\sqrt{2}\approx 28.284271247
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2\times 10\sqrt{2}
Factor 200=10^{2}\times 2. Rewrite the square root of the product \sqrt{10^{2}\times 2} as the product of square roots \sqrt{10^{2}}\sqrt{2}. Take the square root of 10^{2}.
20\sqrt{2}
Multiply 2 and 10 to get 20.
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