Evaluate
243\sqrt{3}\approx 420.888346239
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3\times 81\sqrt{3}
Factor 19683=81^{2}\times 3. Rewrite the square root of the product \sqrt{81^{2}\times 3} as the product of square roots \sqrt{81^{2}}\sqrt{3}. Take the square root of 81^{2}.
243\sqrt{3}
Multiply 3 and 81 to get 243.
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