Evaluate
20\sqrt{2}\approx 28.284271247
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\sqrt{20}\sqrt{20}\sqrt{2}
Factor 40=20\times 2. Rewrite the square root of the product \sqrt{20\times 2} as the product of square roots \sqrt{20}\sqrt{2}.
20\sqrt{2}
Multiply \sqrt{20} and \sqrt{20} to get 20.
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