Evaluate
20\pi \approx 62.831853072
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\frac{2}{4}\pi \times 40
Multiply \frac{1}{4} and 2 to get \frac{2}{4}.
\frac{1}{2}\pi \times 40
Reduce the fraction \frac{2}{4} to lowest terms by extracting and canceling out 2.
\frac{40}{2}\pi
Multiply \frac{1}{2} and 40 to get \frac{40}{2}.
20\pi
Divide 40 by 2 to get 20.
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