Evaluate
20\sqrt{2}\approx 28.284271247
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\sqrt{800}
Multiply 20 and 40 to get 800.
20\sqrt{2}
Factor 800=20^{2}\times 2. Rewrite the square root of the product \sqrt{20^{2}\times 2} as the product of square roots \sqrt{20^{2}}\sqrt{2}. Take the square root of 20^{2}.
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