Evaluate
10\pi \approx 31.415926536
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20\pi \times \frac{1}{2}
Reduce the fraction \frac{180}{360} to lowest terms by extracting and canceling out 180.
\frac{20}{2}\pi
Multiply 20 and \frac{1}{2} to get \frac{20}{2}.
10\pi
Divide 20 by 2 to get 10.
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