Evaluate
\frac{\sqrt{3}}{6}\approx 0.288675135
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\frac{20}{2}\times \frac{\sqrt{3}}{60}
Multiply 20 and \frac{1}{2} to get \frac{20}{2}.
10\times \frac{\sqrt{3}}{60}
Divide 20 by 2 to get 10.
\frac{\sqrt{3}}{6}
Cancel out 60, the greatest common factor in 10 and 60.
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