Evaluate
\frac{5\pi }{4}\approx 3.926990817
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\frac{5}{8} \cdot 2 * \pi
Substitute 2 * \pi for \tau.
\frac{5\times 2}{8}\pi
Express \frac{5}{8}\times 2 as a single fraction.
\frac{10}{8}\pi
Multiply 5 and 2 to get 10.
\frac{5}{4}\pi
Reduce the fraction \frac{10}{8} to lowest terms by extracting and canceling out 2.
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