Evaluate
81\sqrt{3}\approx 140.296115413
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162\times \frac{1}{2}\sqrt{3}
Multiply 9 and 18 to get 162.
\frac{162}{2}\sqrt{3}
Multiply 162 and \frac{1}{2} to get \frac{162}{2}.
81\sqrt{3}
Divide 162 by 2 to get 81.
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