Evaluate
\frac{\pi }{10}\approx 0.314159265
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2\pi \sqrt{\frac{1}{400}}
Expand \frac{0.1}{40} by multiplying both numerator and the denominator by 10.
2\pi \times \frac{1}{20}
Rewrite the square root of the division \frac{1}{400} as the division of square roots \frac{\sqrt{1}}{\sqrt{400}}. Take the square root of both numerator and denominator.
\frac{2}{20}\pi
Multiply 2 and \frac{1}{20} to get \frac{2}{20}.
\frac{1}{10}\pi
Reduce the fraction \frac{2}{20} to lowest terms by extracting and canceling out 2.
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